Begin implementation of receive functionality

- Add code authored by Saurabh Sharma (@saurabhrpi) into ReceiveActivity
- Add XML authored by Saurabh Sharma (@saurabhrpi) into AndroidManifest
- Comment out malformed XML authored by by Saurabh Sharma (@saurabhrpi)
in AndroidManifest
- Add new XML layout file for ReceiveActivity
- Delete obsolete file receiver_fragment.xml