Start populating the GitHub page

Author: stwrt

Sources/WebKit/WebKit.docc/InDepth/GitHub/GitHub.md

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 # GitHub
 
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+WebKit on GitHub
 
 ## Overview
 
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+![WebKit GitHub Home Page](GitHub.png)
+
+WebKit officially switched over to using GitHub for managing source code in June of 2022. The announcement can be found on the WebKit blog [here](https://webkit.org/blog/13140/webkit-on-github/).
+
+WebKit uses a pretty standard git workflow with some custom additions on top.
 
 ## Topics