Update README.md

Author: Chman

README.md

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 # Post-processing Stack (beta)
 
-Please read [the documentation](https://github.com/Unity-Technologies/PostProcessing/wiki).
+Need help ? Check out the [quick start guide](https://github.com/Unity-Technologies/PostProcessing/wiki) and [the official forums](https://forum.unity3d.com/forums/image-effects.96/) !
+
+Found a bug ? Let us know and [post an issue](https://github.com/Unity-Technologies/PostProcessing/issues) !