Improve readme (update description, add links and instructions).

README.md

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-Call of Pripyat expansion
-=========================
+X-Ray Engine 1.6 expansion
+==========================
 
-This repository contains the Stalker: Call of Pripyat source code version 1.6.02. 
+This repository contains X-Ray Engine sources based on version 1.6.02.
+The original engine is used in S.T.A.L.K.E.R. Call of Pripyat game released by GSC Game World.
 
-It is a place to share ideas on what to implement, gather people that
-want to work on the engine, and work on the source code.
+It is a place to share ideas on what to implement, gather people that want to work on the engine,
+and work on the source code.
 
-Update 9/24/2014: The VS2008 COP source will continue to be available here, 
-however this project now has a new home at: https://github.com/OpenXRay
+If you find a bug or have an enhancement request, file an [Issue](https://github.com/openxray/xray-16/issues).
+
+Pull requests appreciated! Just check out [the version plan](https://github.com/openxray/xray-16/blob/master/doc/design/version_plan.txt) 
+and follow [coding](https://github.com/openxray/xray-16/blob/master/doc/procedures/cpp_code.txt) 
+and [committing](https://github.com/openxray/xray-16/blob/master/doc/procedures/commit_coding.txt) conventions.