Add contribution guide and issue templates

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,53 @@
+name: Bug Report
+description: File a bug report.
+title: "[BUG]: ..."
+labels: ["bug"]
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      Thank you for taking the time to file a bug report.
+      Please also check the issue tracker for existing issues about the bug.
+
+- type: textarea
+  attributes:
+    label: "Describe the issue:"
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: "Reproduceable code example:"
+    description: >
+      A short code example that reproduces the problem/missing feature.
+    placeholder: |
+      << your code here >>
+    render: python
+  validations:
+    required: false
+
+- type: textarea
+  attributes:
+    label: "Error message:"
+    description: >
+      Please include full error message, if any.
+    placeholder: |
+      <details>
+      Full traceback starting from `Traceback: ...`
+      </details>
+    render: shell
+
+- type: textarea
+  attributes:
+    label: "Version information:"
+    description: >
+      EOS Version or commit SHA:
+      Operating system:
+      How did you install EOS?
+    placeholder: |
+      <details>
+      configuration information
+      </details>
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/developer.yml

@@ -0,0 +1,9 @@
+name: Developer issue
+description: This template is for developers/maintainers only!
+
+body:
+- type: textarea
+  attributes:
+    label: Description
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/enhancement.yml

@@ -0,0 +1,33 @@
+name: Enhancement
+description: Make a specific, well-motivated proposal for a feature.
+title: "[ENH]: ..."
+labels: [enhancement]
+
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      Please post your idea first as a [Discussion](https://github.com/Akkudoktor-EOS/EOS/discussions)
+      to validate it and bring attention to it. After validation,
+      you can open this issue for a more technical developer discussion.
+      Check the [Contributor Guide](https://github.com/Akkudoktor-EOS/EOS/blob/main/CONTRIBUTING.md)
+      if you need more information.
+
+- type: textarea
+  attributes:
+    label: "Link to discussion and related issues"
+    description: >
+      <link here>
+    render: python
+  validations:
+    required: false
+
+- type: textarea
+  attributes:
+    label: "Proposed implementation"
+    description: >
+      How it could be implemented with a high level API.
+    render: python
+  validations:
+    required: false

CONTRIBUTING.md

@@ -0,0 +1,48 @@
+# Contributing to EOS
+
+Thanks for taking the time to read this!
+
+The `EOS` project is in early development, therefore we encourage contribution in the following ways:
+
+## Bug Reports
+
+Please report flaws or vulnerabilities in the [GitHub Issue Tracker]((https://github.com/Akkudoktor-EOS/EOS/issues)) using the corresponding issue template.
+
+## Ideas & Features
+
+Please first discuss the idea in a [GitHub Discussion](https://github.com/Akkudoktor-EOS/EOS/discussions) or the [Akkudoktor Forum](https://www.akkudoktor.net/forum/diy-energie-optimierungssystem-opensource-projekt/) before opening an issue.
+
+There are just too many possibilities and the project would drown in tickets otherwise.
+
+## Code Contributions
+
+We welcome code contributions and bug fixes via [Pull Requests](https://github.com/Akkudoktor-EOS/EOS/pulls).
+To make collaboration easier, we require pull requests to pass code style and unit tests.
+
+### Code Style
+
+Our code style checks use [`pre-commit`](https://pre-commit.com).
+
+```bash
+pip install -r requirements.txt
+```
+
+To run formatting automatically before every commit:
+
+```bash
+pre-commit install
+```
+
+Or run them manually:
+
+```bash
+pre-commit --all
+```
+
+### Tests
+
+Use `pytest` to run tests locally:
+
+```bash
+python -m pytest -vs --cov modules --cov-report term-missing tests/
+```

README.md

@@ -4,7 +4,7 @@ This project provides a comprehensive solution for simulating and optimizing an
 
 ## Getting Involved
 
-The discussion takes place in the [forum](https://www.akkudoktor.net/forum/diy-energie-optimierungssystem-opensource-projekt/). Please report bugs in the [Issue Tracker](https://github.com/Akkudoktor-EOS/EOS/issues). We welcome code contributions and bug fixes via [Pull Requests](https://github.com/Akkudoktor-EOS/EOS/pulls).
+See [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## Installation