Adds first version of the CONTRIBUTING

CONTRIBUTING.md

@@ -0,0 +1,13 @@
+# How to contribute
+
+There is no rocket science to contributing to this project. Just open your issue or pull request if needed - but please be descriptive!
+
+If this project grows sufficiently, I will create templates for **Pull Request** and **Issue**, so there will be no chaos when dealing with any changes.
+
+To submit a PR, follow [these guidelines](https://gist.github.com/MarcDiethelm/7303312), respect the swiftlint static checks (modifications/exceptions may be discussed), and create an awesome description so we can understand it without asking any whys. 
+
+Even though there is no "rules" to how you should contribute, there goes my quick tips on it:
+
+- If you're experiencing a bug that can be demonstrated visually, please take screenshots and post them alongside the issue;
+- For a quicker/seamless understanding of the issue, please post a sample project, so the evaluation will be bulletproof;
+- This is a git overall tip - do atomic commits with a descriptive message (no more than 50 characters is ideal).