New Code-Review rules

Author: julienschmidt

README.md

@@ -162,7 +162,10 @@ However, many want to scan MySQL `DATE` and `DATETIME` values into `time.Time` v
 ## Testing / Development
 To run the driver tests you may need to adjust the configuration. See [this Wiki-Page](https://github.com/go-sql-driver/mysql/wiki/Testing "Testing") for details.
 
-Go-MySQL-Driver is not feature-complete yet. Your help is very appreciated. If you want to contribute, you can work on an [open issue](https://github.com/go-sql-driver/mysql/issues?state=open).
+Go-MySQL-Driver is not feature-complete yet. Your help is very appreciated.
+If you want to contribute, you can work on an [open issue](https://github.com/go-sql-driver/mysql/issues?state=open) or review a [pull request](https://github.com/go-sql-driver/mysql/pulls).
+
+Code changes must be proposed via a Pull Request and must be reviewed. Only *LGTM*ed (*Looks good to me*) code may be committed to the master branch. 
 
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