Create CONTRIBUTING.md

Author: Rayhan Arayilakath

CONTRIBUTING.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. Complete a quick code review for your code, you might catch any errors before you submit.
+2. Make sure your pull request uses the most recent version of the code.
+3. Ensure any dependencies match with current dependencies or have essential dependencies. Dev dependencies should be removed before submitting a pull request.
+4. Update the README.md with changes if necessary. This includes any major changes to the features, usage of the package, etc.
+5. 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/).
+6. You may merge the Pull Request in once you have the approval of repository maintainer or owner, or if you do not have permission to do that, you may request a reviewer to merge it for you.