added changelog ready for V2.0 release

CHANGELOG.md

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+	OpenSeizureDetector Android App - Change Log
+	============================================
+
+	V2.0 - January 2015
+	Behind the Scenes
+	- Merged the server and client apps so only one app is needed to remove code duplication.
+	- Major rewrite of background service back-end to handle different data sources - either pebble or network so it can act as either server or client.
+
+	User Interface
+	- Added start-up screen that shows the bits of the system starting and confirms they work before showing the main screen.
+	- start-up screen has buttons to change the settings.
+	- If pebble datasource is selected, start-up screen has an option to
+	open the pebble app to manage pebble connection issues, and to install the watch-app directly.
+	- The main screen has been tidied up a bit, and now includes bar graphs to show how close to alarming the current movement is..
+	- Settings screen broken down into different logical screens to make it easier to find a setting to change.
+	- Changing a setting now re-starts the whole app to make sure the new setting is being used.
+	- Added an 'about' page with links to http://openseizuredetector.org.uk web site and copyright and acknowledgement notices.
+	- Added ability to latch alarms so they have to be actively accepted to silence the alarm, rather than it re-setting when the movement stops.
+	- Fixed problem with the system being difficult to shut down if as multiple instances of main screen could be active at once.
+