rename Android Beam sample to Andriod Beam Demo and add launcher icon

Change-Id: If6edb7ac9ba2743ce0dbc39be6f1eede8ef66aaa
diff --git a/samples/AndroidBeamDemo/_index.html b/samples/AndroidBeamDemo/_index.html
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+<p>Android Beam Demo shows how to use the Android Beam feature introduced in API level 14. This
+application beams a simple message from one device to another when they are in close enough proximity. This
+application must be installed on two devices that have NFC capabilities, running Android 4.0 or later.</p>