Merge pull request #846 from astaxie/master

move CONTRIBUTING to root

CONTRIBUTING.md

@@ -19,7 +19,7 @@ This is a rough outline of what a contributor's workflow looks like:
 - Make sure your commit messages are in the proper format (see below).
 - Push your changes to a topic branch in your fork of the repository.
 - Submit a pull request to pingcap/tidb.
-- Your PR must receive LGTMs from two maintainers found in the [MAINTAINERS](./MAINTAINERS.md) file.
+- Your PR must receive LGTMs from two maintainers found in the [MAINTAINERS](./docs/MAINTAINERS.md) file.
 
 Thanks for your contributions!
 

README.md

@@ -46,7 +46,7 @@ Read the [Quick Start](./docs/QUICKSTART.md)
 ![architecture](./docs/architecture.png)
 
 ## Contributing
-Contributions are welcomed and greatly appreciated. See [CONTRIBUTING.md](./docs/CONTRIBUTING.md)
+Contributions are welcomed and greatly appreciated. See [CONTRIBUTING.md](CONTRIBUTING.md)
 for details on submitting patches and the contribution workflow.
 
 ## Follow us