added contribution.md file

contribution.md

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+# 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, 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, useful 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 in 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.
+
+## Code of Conduct
+
+### Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+
+contributors and maintainers pledge to making participation in our project and
+
+our community a harassment-free experience for everyone, regardless of age, body
+
+size, disability, ethnicity, gender identity and expression, level of experience,
+
+nationality, personal appearance, race, religion, or sexual identity and
+
+orientation.
+
+### Our Standards
+
+Examples of behavior that contributes to creatin
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