Create CONTRIBUTING.md

Author: Alexis Huvier

CONTRIBUTING.md

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+# How to contribute
+
+SharpEngine is a little project and I am happy to see that people want to contribute to it. So thanks !
+
+To contribute efficiently, there is some things that you can do.
+
+## Reporting bugs, proposing features or improvements
+
+You can simply make an issue with the template (soon).
+
+## Contributing pull requests
+
+If you want to add your own features / bug fixes, please make sure that :
+- This features is usable in real projets.
+- You talked with other developer if somebody work on that already.
+- Your work follows code style and git guidelines
+
+If you want to add a feature / bug fixes, you can find some in issues of this projects.
+
+### Git Guidelines
+
+- Try to make simple PRs (or issues) which target one specific topic.
+- Try to keep a clean git history.
+- Try to keep relevent and short branches names. Use dashes to separate words.
+- Try you work before pushing.
+
+### Code Style Guidelines
+
+- Use CSharpier to format your work. It's already installed in every SharpEngine's Project.