Updated readme and added changelog

CHANGELOG

@@ -0,0 +1,19 @@
+
+0.2.0 2015xxxx Major overhaul of underlying processing chain and extensive 
+      updates to all decoders and filters
+      - Resolved issue with memory leaks and crashes
+      - New audio playback interface with global mute and support for one or two
+        audio channels
+      - Audio playback is prioritized using a new Call Priority alias action
+        with selected channels having the highest priority and any audio without
+        an alias identifier having the lowest priority.
+      - Audio recording by call with new 'Non-Recordable' alias action
+      - (planned)Added Ettus UHD support for B100 with WBX tuner
+      - (planned)Added Airspy tuner support
+      
+0.1.5 20150612 Added initial P25 Decoder support with integrated audio decoding
+      using the JMBE library   
+
+0.1.4 20150528 Updated test P25 Decoder
+
+0.1.3 20150512 Initial test P25 Decoder support

README.md

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 # sdrtrunk
-A cross-platform java application for decoding, monitoring, recording and streaming trunked mobile and related radio protocols using Software Defined Radios (SDR).  Website:
+A cross-platform java application for decoding, monitoring, recording and streaming trunked mobile and related radio protocols using Software Defined Radios (SDR).
+
+* [Getting Started](GettingStarted)
+* [User's Manual](UserManual)
+* [Download](https://drive.google.com/folderview?id=0B7BHsssXUq8eOHBTNndCczZTd0k&usp=sharing)
+* [Support](https://groups.google.com/forum/#!forum/sdrtrunk)
 
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