added: PhoneStateChangeListener plugin, see README.md for details

Android/PhoneStateChangeListener/README.md

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+PhoneStateChangeListener
+========================
+
+Cordova plugin to provide callback when Telephony state changes
+
+Possible states are IDLE, OFFHOOK and RINGING
+
+Get this at https://github.com/madeinstefano/PhoneStateChangeListener
+
+# to use:
+
+1 - Import the .js file plugin right after your cordova.js file (index.html)
+2 - Import the .java file inside your src folder
+3 - Setup the callback to handle when state changes in your js:
+
+    plugins.PhoneStateChangeListener.start(function (state){
+      // do stuff with the state
+    });
+
+3 - Possible values to 'state' variable are:
+
+    plugins.PhoneStateChangeListener.IDLE // when the none call are being made
+    plugins.PhoneStateChangeListener.RINGING // when the phone is ringing
+    plugins.PhoneStateChangeListener.OFFHOOK // when the phone is busy
+    plugins.PhoneStateChangeListener.NONE // when something goes wrong
+
+4 - To stop listening to this:
+
+    plugins.PhoneStateChangeListener.stop();
+
+
+# version 1
+- Added basic support to listen when Telephony state changes
+- Added feature to remove this listener