Added about dialog in sample app

sample_app/res/values/strings.xml

@@ -5,14 +5,13 @@
     <string name="app_name">Bluetooth LE Scanner</string>
     <string name="connected">Connected</string>
     <string name="disconnected">Disconnected</string>
-    <string name="hello_world">Hello world!</string>
     <string name="no_data">No data</string>
     <string name="not_supported">Not supported</string>
     <string name="off">Off</string>
     <string name="on">On</string>
     <string name="supported">Supported</string>
     <string name="unknown_characteristic">Unknown characteristic</string>
-    <string name="unknown_device">Unknown Device</string>
+    <string name="unknown_device">Unknown device</string>
     <string name="unknown_service">Unknown service</string>
 
     <!-- Formatters -->
@@ -20,6 +19,7 @@
     <string name="formatter_db">%sdb</string>
 
     <!-- Menu items -->
+ 	<string name="menu_about">About</string>
     <string name="menu_connect">Connect</string>
     <string name="menu_disconnect">Disconnect</string>
     <string name="menu_scan">Scan</string>
@@ -37,4 +37,7 @@
     <string name="label_tx_power">TX Power:</string>
     <string name="label_uuid">UUID:</string>
 
+
+     <string name="about_dialog_text">This is a sample application using the Bluetooth LE Library.\n\nGithub: https://github.com/alt236/Bluetooth-LE-Library---Android\n\nCopyright: Alexandros Schillings</string>
+
 </resources>