Added a simple 'about' dialog box with menu item to show it.

app/src/main/res/layout/about_layout.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2009 The Android Open Source Project
+          http://www.apache.org/licenses/LICENSE-2.0
+-->
+<ScrollView>
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="20dip">
+
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="16sp"
+        android:autoLink="web"
+        android:text="OpenSeizureDetector epileptic\n
+(tonic-clonic) seizure detector and \n
+alarm system.  Uses a Pebble Smart\n
+watch to detect the shaking \n
+associated with a seizure, \n
+then raises audible and text\n
+message (SMS) alerts for carers.\n
+The system is free and open source - see \n
+http://openseizuredetector.org.uk for details.
+Please report any issues to graham@openseizuredetector.org.uk\n
+or raise an issue on the project github source code \n
+repository - https://github.com/OpenSeizureDetector"
+        />
+
+    <TextView
+        android:id="@+id/about_credits"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:paddingTop="20dip"
+        android:textSize="16sp"
+        android:text="Main Watch App and Android App \n
+copyright Graham Jones, 2015.\n
+The following libraries are used:\n
+- SYLT-FFT - https://github.com/stg/SYLT-FFT by D. Taylor.\n
+- NanoHTTPD - https://github.com/NanoHttpd/nanohttpd\n
+- jQuery - http://jquery.org\n
+- jBeep - http://www.ultraduz.com.br\n
+- Chartjs - http://www.chartjs.org\n
+- MPAndroidChart - https://github.com/PhilJay/MPAndroidChart\n
+\n
+The Logo is based on Star of life2 by Verdy P, \n
+Licensed under Public Domain via\n
+Wikimedia Commons (http://commons.wikimedia.org/wiki/File:Star_of_life2.svg#mediaviewer/File:Star_of_life2.svg).
+"
+        android:autoLink="web"
+        />
+
+</LinearLayout>
+</ScrollView>