Update README.md

Author: BocuD

README.md

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 # VRChatApiTools
- A library to interact with and extend the VRChat SDK inside Unity
+ A library to interact with and extend the VRChat SDK. Doesn't do anything on its own, but provides editor extension developers with tools to more easily interact with VRChat SDK data, and contains an alternate uploader that doesn't run in playmode.
+
+Documentation: soon™
+
+For implementation examples, look at [VRBuildHelper](https://github.com/BocuD/VRBuildHelper) and [AvatarImageReader](https://github.com/Miner28/AvatarImageReader/)