Update README.md

Author: mgp25

README.md

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-# Chat-API-NET
-The .NET WhatsApp library 
+Chat API .NET
+===========
+
+This is an API written in C# but it can be used in any .NET language. It's a fork from WhatsAPINet, which is based on Chat API (php).
+
+## Documentation
+* FunXMPP Protocol - https://github.com/mgp25/Chat-API/wiki/FunXMPP-Protocol
+
+## Protocol
+More info in Chat API repo wiki https://github.com/mgp25/Chat-API
+
+**Special thanks to [shirioko](https://github.com/shirioko)**