Updated readme

Author: simonrob

README.md

@@ -1,4 +1,19 @@
-codetalk
+CodeTalk
 ========
 
-An Android app for creating discussions around digital markers
+An Android app for creating discussions around digital markers. Allows you to scan barcodes, QR codes and other digital markers, and then attach messages to them. Anyone else who scans the same code using the app will then see your message.
+
+
+How do I use it?
+----------------
+Clone this repository and import into Eclipse ("Import Existing Android Code Into Workspace"). Note that you will also need the [CodeTalk-Library source](https://github.com/EnteriseToolkit/codetalk-library).
+
+
+License
+-------
+Apache v2.0
+
+
+Additional requirements
+-------
+As well as [CodeTalk-Library](https://github.com/EnteriseToolkit/codetalk-library), you will also need [ActionBarSherlock](https://github.com/JakeWharton/ActionBarSherlock).