Merge pull request globalsign#22 from globalsign/feature/contribution-guidelines

Add contribution guidelines

Author: domodwyer

CONTRIBUTING.md

@@ -0,0 +1,14 @@
+Contributing
+-------------------------
+
+We really appreciate contributions, but they must meet the following requirements:
+
+* A PR should have a brief description of the problem/feature being proposed
+* Pull requests should target the `development` branch
+* Existing tests should pass and any new code should be covered with it's own test(s) (use [travis-ci](https://travis-ci.org))
+* New functions should be [documented](https://blog.golang.org/godoc-documenting-go-code) clearly
+* Code should pass `golint`, `go vet` and `go fmt`
+
+We merge PRs into `development`, which is then tested in a sharded, replicated environment in our datacenter for regressions. Once everyone is happy, we merge to master - this is to maintain a bit of quality control past the usual PR process.
+
+**Thanks** for helping!