Add README file and add link to the app on the Android Market!

https://market.android.com/details?id=com.madgag.agit

CREDITS.markdown

@@ -4,7 +4,8 @@ Agit - Android Git Client
 
 © 2011 Roberto Tyley
 
-This app can bought on the Android Market, doing so supports the author in the creation of open-source software.
+This app can bought on the [Android Market](https://market.android.com/details?id=com.madgag.agit),
+doing so supports the author in the creation of open-source software.
 
 The source code is freely available:
 

README.markdown

@@ -0,0 +1,16 @@
+Agit - Android Git Client
+=========================
+
+https://market.android.com/details?id=com.madgag.agit
+
+Agit is an open-source Git client for Android devices, allowing you to checkout the entire history of any Git repository while on the move, review changes and store for full offline access.
+
+ - Clone remote Git repositories onto your phone!
+ - Just like regular Git, the full history is stored for offline access.
+ - Animated Diffs - Watch diffs smoothly transition from Before to After - and back again. I'm using 'smoothly' figuratively here. It's still pretty cool.
+ - Supports git, http, https protocols. SSH for private repos  also available if you don't mind jumping through some hoops (coming soon: fewer hoops!).
+ - Currently this is a 'read-only' client. You can clone & fetch, but not commit and push. I haven't yet had time to build all the user interface around that - but I reckon implementing pinch-gesture-branch-merge would be fun.
+ - Periodic sync enabled on Android 2.2 and later - latest commits fetched quarter-hourly.
+ - Cloning substantial projects like Mongo or JQuery will take a few minutes to perform - fortunately subsequent fetches will be much faster.
+
+