reformat instructions

README.md

@@ -14,14 +14,24 @@ line, you can:
 
 ## Usage
 
-0. Install the package from Atom > Settings > Install
-1. Install DCMTK on your system:
+### Install the package
+
+Install the package from Atom > Settings > Install
+
+### Install DCMTK
+
  * **Windows**: you can download pre-compiled DCMTK binaries from
    https://github.com/QIICR/dcmtk-dcmqi/releases (here is the [direct download link](https://github.com/QIICR/dcmtk-dcmqi/releases/download/DCMTK-dcmqi-3.6.1_20161102-VS12-Win64-Release-v0.0.11-static/DCMTK-dcmqi.zip)). You will also need to download and install [Visual C++ Redistributable Packages for Visual Studio 2013](http://www.microsoft.com/en-us/download/details.aspx?id=40784). `DCMTK_PATH` should point to the `bin` folder inside the unzipped `DCMTK-dcmqi.zip` package. Note that you will not be able to use DCMTK binaries from 3D Slicer (the approach discussed below for Mac and Lunux will not work on Windows!)
  * **Mac**: you can download and install [3D Slicer application](http://download.slicer.org) package for Mac, which contains pre-compiled DCMTK tools. If you install 3D Slicer into the standard system location, `DCMTK_PATH` should point to `/Applications/Slicer.app/Contents/bin`
  * **Linux**: you can download and install [3D Slicer application](http://download.slicer.org) for Linux, which contains pre-compiled DCMTK tools. `DCMTK_PATH` should point to the `bin` directory inside the unzipped Linux package of 3D Slicer.
-2. Set the location of the DCMTK executables to `DCMTK_PATH` specific to your system in the dicom-dump package settings
-3. After opening a DICOM file in Atom, use context menu to invoke `dcmdump` or `dsrdump` tools.
+
+### Set DCMTK path in the package settings
+
+![Screenshot](https://raw.githubusercontent.com/QIICR/atom-dicom-dump/master/screenshots/dcmtk_path_settings.jpg)
+
+### Activate package after opening a DICOM file
+
+After opening a DICOM file in Atom, use context menu to invoke `dcmdump` or `dsrdump` tools.
 
 ## Status