Add CONTRIBUTING.md (ByteByteGoHq#45)

CONTRIBUTING.md

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+Contributing
+============
+
+Thank you for your interest in contributing! Here are some guidelines to follow when submitting pull requests:
+
+## Pull Requests
+
+* Each pull request should focus on a single topic or concept.
+* Avoid making changes across multiple topics in the same PR.
+* Give your PR a clear title summarizing the topic you are addressing.
+* If you notice typos or issues in diagrams, please open a separate issue instead of fixing the images directly. We will update the source images and republish fixes.
+
+### GitHub Pull Requests Docs
+
+If you are not familiar with pull requests, review the [pull request docs](https://help.github.com/articles/using-pull-requests/).