add initial varsion of doc directory

doc/.gitignore

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+# Ignore auto-generated documentation for the addendum
+build

doc/Makefile

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+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SPHINXPROJ    = CMEPS
+SOURCEDIR     = source
+BUILDDIR      = build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

doc/source/_static/pop_ver.js

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+$(document).ready(function() {
+    /* For a URL that looks like
+    https://blah.github.io/versions/VERSIONFOO/html/bar/index.html, set cur_version_dir to
+    'VERSIONFOO' (i.e., the portion of the path following 'versions').
+    */
+    var proj_end = document.baseURI.indexOf("versions") + 9;
+    var end = document.baseURI.indexOf("/", proj_end);
+    var cur_version_dir = document.baseURI.substring(proj_end, end);
+    var mylist = $("#version-list");
+    mylist.empty();
+    $.getJSON(version_json_loc, function(data) {
+        if (data.hasOwnProperty(cur_version_dir)) {
+            /* First add the current version so that it appears first in the drop-down
+               menu and starts as the selected element of the menu. If you click on the
+               current version, you should stay at the current page.
+
+               The conditional around this block should generally be true, but we check it
+               just in case the current version is missing from the versions.json file for
+               some reason.
+            */
+            cur_version_name = data[cur_version_dir];
+            mylist.append($("<option>", {value: document.baseURI, text: cur_version_name}));
+        }
+        // Now add the other versions
+        $.each(data, function(version_dir, version_name) {
+            if (version_dir != cur_version_dir) {
+                /* If you click on a different version, you should go to the root of the
+                   documentation for that version. This assumes paths like
+                   https://blah.github.io/versions/VERSIONFOO/html/bar/index.html. So we
+                   need to go up two levels from the URL_ROOT (html) to then go back down
+                   into the appropriate version's html directory.
+                */
+                mylist.append($("<option>", {value: DOCUMENTATION_OPTIONS.URL_ROOT + '../../' + version_dir + '/html', text: version_name}));
+            }
+        });
+    });
+});

doc/source/_templates/footer.html

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+{% extends "!footer.html" %}
+{% block extrafooter %}
+    {{ super() }}
+<script>var version_json_loc = "{{ pathto('../../versions.json', 1) }}";</script>
+{% endblock %}

doc/source/_templates/layout.html

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+{% extends "!layout.html" %}
+
+{% set script_files = script_files + ["_static/pop_ver.js"] %}

doc/source/conf.py

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+# -*- coding: utf-8 -*-
+#
+# on documentation build configuration file, created by
+# sphinx-quickstart on Tue Jan 31 19:46:36 2017.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+import os
+import sys
+# Note that we need a specific version of sphinx_rtd_theme. This can be obtained with:
+# pip install git+https://github.com/esmci/sphinx_rtd_theme.git@version-dropdown-with-fixes
+import sphinx_rtd_theme
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.todo',
+    'sphinx.ext.coverage',
+    'sphinx.ext.githubpages',
+    'sphinx.ext.autodoc',
+    'sphinx.ext.autosummary',
+    'sphinx.ext.viewcode',
+    'sphinx.ext.todo',
+    'sphinxcontrib.programoutput'
+]
+todo_include_todos=True
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'CMEPS'
+copyright = u'2020, U.S. National Science Foundation'
+author = u'Staff of the NSF/CESM project and NOAA/EMC'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = u'master'
+# The full version, including alpha/beta/rc tags.
+release = u'master'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = []
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = True
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+#html_theme_options = {"stickysidebar": "true"}
+
+# The 'versions' option needs to have at least two versions to work, but it doesn't need
+# to have all versions: others will be added dynamically. Note that this maps from version
+# names to html links. The current version can link to the current location (i.e., do
+# nothing). For the other version, we just add a place-holder; its name and value are
+# unimportant because these versions will get replaced dynamically.
+html_theme_options = {}
+html_theme_options['versions'] = {version: ''}
+html_theme_options['versions']['[placeholder]'] = ''
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# -- Options for HTMLHelp output ------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'ondoc'
+
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (master_doc, 'on.tex', u'on Documentation',
+     u'Staff of the NCAR and NOAA/EMC', 'manual'),
+]
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'on', u'on Documentation',
+     [author], 1)
+]
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (master_doc, 'on', u'on Documentation',
+     author, 'on', 'One line description of project.',
+     'Miscellaneous'),
+]
+
+# -- Options for pdf output -------------------------------------------------
+
+pdf_documents = [
+    (master_doc,
+     u'CMEPS_Users_Guide',
+     u'CMEPS Users Guide (PDF)',)
+]

doc/source/index.rst

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+.. on documentation master file, created by
+   sphinx-quickstart on Mon May 18 11:50:23 2020.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+CMEPS documentation
+===================
+The Community Mediator for Earth Prediction Systems (CMEPS) is a 
+NUOPC-compliant Mediator component used for coupling Earth system 
+model components. It is currently being used in NCAR's Community 
+Earth System Model (CESM) and NOAA's subseasonal-to-seasonal 
+coupled system.
+
+Table of contents
+-----------------
+.. toctree::
+   :maxdepth: 2
+
+   introduction.rst

doc/source/introduction.rst

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+Introduction
+============
+
+Content to go here: