readme update

Author: mblanchou

README.md

@@ -1,2 +1,21 @@
 Android-OpenDebug
 =================
+Make any application debuggable on a device.
+
+Description
+-------
+It leverages Cydia Substrate to make all applications debuggable. This then allows any application, to accept a debugger to attach to them. 
+
+Usage
+-------
+* Install Android-OpenDebug.apk on a device where Cydia Substrate is installed with:
+
+        adb install Android-OpenDebug.apk
+
+* Cydia Substrate can be found on Google Play 
+(https://play.google.com/store/apps/details?id=com.saurik.substrate&hl=en) 
+and requires a rooted device.
+
+Notes
+-------
+* This should only be used on test devices