Updated Readme

README.md

 # CaseLights
 
+CaseLights is an Arduino based RGB LED controller using a simple MOSFET setup. The lights are controlled with a Mac OS X Menu Bar App that can set static colors, animations, or visualize various computer status values using the included [JSystemInfoKit](https://github.com/jBot-42/JSystemInfoKit).
+
+## Mac OS X App
+
+The CaseLights XCode project includes the JSystemInfoKit project from the submodule in this repository. Just run `xcodebuild` on the command line or open the project in XCode and click `Run` to start the App.
+
+![Screenshot](https://i.imgur.com/N7j7BJV.png)
+
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