add : CONTRIBUTING.md added. (#1)

.github/CONTRIBUTING.md

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+# Contribution			
+
+Changes and improvements are more than welcome! ❤️ Feel free to fork and open a pull request.
+
+Please consider the following :
+
+1. Fork it!
+2. Create your feature branch (under `dev` branch)
+3. Add your new features or fix detected bugs
+4. Add standard `docstring` to your functions
+5. Update `README.md` (if needed)
+6. Pass all CI tests
+7. Update `CHANGELOG.md`
+	- Describe changes under `[Unreleased]` section
+8. Update `AUTHORS.md`
+	- Add your name under `# Other Contributors #` section
+9. Submit a pull request into `dev` (please complete the pull request template)
+