chore: add contributing guidlines

CONTRIBUTING.md

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+# Contributing
+
+[![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
+
+When contributing to this repository, it is usually a good idea to 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. This could potentially save a lot of wasted hours.
+
+Please note we have a code of conduct, please follow it in all your interactions with the project.
+
+## Development
+
+### Commit Message Format
+
+All commits on the this repository follow the
+[Conventional Changelog standard](https://github.com/conventional-changelog/conventional-changelog-eslint/blob/master/convention.md).
+It is a very simple format so you can still write commit messages by hand. However it is
+highly recommended developers install [Commitizen](https://commitizen.github.io/cz-cli/),
+it extends the git command and will make writing commit messages a breeze. This
+repository is configured with a local Commitizen configuration script.
+
+Getting Commitizen installed is usually trivial, just install it via npm. You will also
+need to install the cz-conventional-changelog adapter which this repository is configured
+to use.
+
+```bash
+npm install -g commitizen cz-conventional-changelog
+```
+
+Below is an example of Commitizen in action. It replaces your usual `git commit` command
+with `git cz` instead. The new command takes all the same arguments however it leads you
+through an interactive process to generate the commit message.
+
+![Commitizen friendly](http://aparapi.com/images/commitizen.gif)
+
+Commit messages are used to automatically generate our changelogs, and to ensure
+commits are searchable in a useful way. So please use the Commitizen tool and adhere to
+the commit message standard or else we cannot accept Pull Requests without editing
+them first.
+
+Below is an example of a properly formated commit message.
+
+```
+chore(Commitizen): Made repository Commitizen friendly.
+
+Added standard Commitizen configuration files to the repo along with all the custom rules.
+
+ISSUES CLOSED: #31
+```
+
+### Pull Request Process
+
+1. Ensure that install or build dependencies do not appear in any commits in your code branch.
+2. Ensure all commit messages follow the [Conventional Changelog](https://github.com/conventional-changelog/conventional-changelog-eslint/blob/master/convention.md)
+   standard explained earlier.
+4. Your pull request will either be approved or feedback will be given on what needs to be
+   fixed to get approval.