Added a README for 2.0-beta.1 release.

README.md

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+% Steam Audio 2.0-beta.1
+% Valve Corporation
+
+Supported Platforms
+-------------------
+
+Steam Audio supports Windows (32 bit and 64 bit), Linux (32 bit and 64 bit), macOS, and Android (ARMv-7) platforms.
+
+Supported Integrations
+----------------------
+
+Steam Audio supports Unity 5.2+. Integration with Unreal Engine 4 is currently under development.
+
+Additional Links
+----------------
+- [Steam Audio Homepage](https://valvesoftware.github.io/steam-audio)
+- [Downloads & Documentation](https://valvesoftware.github.io/steam-audio/downloads.html)
+- [Community Forum](http://steamcommunity.com/app/596420/discussions/)
+- [News & Updates](http://steamcommunity.com/app/596420/allnews/)