Create CONTRIBUTING.md

Author: Kristories

CONTRIBUTING.md

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+# Contributing
+
+Contributions are welcome, and are accepted via pull requests.
+Please review these guidelines before submitting any pull requests.
+
+## Process
+
+1. Fork the project
+2. Create a new branch
+3. Code, test, commit and push
+
+## Guidelines
+
+* Send a coherent commit history, making sure each individual commit in your pull request is meaningful.
+* You may need to [rebase](https://git-scm.com/book/en/v2/Git-Branching-Rebasing) to avoid merge conflicts.
+* Please remember that we follow [SemVer](http://semver.org).
+
+## Setup
+
+Clone your fork, then install the dev dependencies :
+
+```bash
+composer install
+```
+
+## Coding Style
+
+Please ensure the coding style running : 
+
+```bash
+composer format
+```
+
+## Tests
+
+Run all tests :
+
+```bash
+composer test
+```