Update CONTRIBUTING.md

Author: dragontheory

CONTRIBUTING.md

@@ -1 +1,23 @@
+# **Contributing**
 
+When contributing to this repository, please first discuss the change you wish to make via issue,
+email, or any other method with the owners of this repository before making a change.
+
+Please note we have a [code of conduct](CODE_OF_CONDUCT.md); please follow it in all your interactions with the project.
+
+## Pull Request Process
+
+1. Ensure any install or build dependencies are removed before the end of the layer when doing a
+   build.
+2. Update the README.md with details of changes to the interface; this includes new environment variables, exposed ports, valid file locations and container parameters.
+3. Increase the version numbers in any examples files and the README.md to the new version that this
+   Pull Request would represent. The versioning scheme we use is [SemVer](http://semver.org/).
+4. You may merge the Pull Request once you have the sign-off of two other developers, or if you
+   do not have permission to do that, you may request the second reviewer to merge it for you.
+
+## Issue Report Process
+
+1. Go to the project's issues.
+2. Select the template that better fits your issue.
+3. Read the instructions carefully and write within the template guidelines.
+4. Submit it and wait for support.