Added CONTRIBUTING.md

Author: alvagante

CONTRIBUTING.md

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+## How to Contribute to This Project
+
+#### **Did You Find a Bug?**
+
+  * **Ensure the bug was not already reported** by searching on GitHub under **Issues**.
+  * If you're unable to find an open issue addressing the problem, **open a new one**. Be sure to include a **title and clear description**, as much relevant information as possible, and a **code sample** or an **executable test case** demonstrating the expected behavior that is not occurring.
+
+#### **Did You Write a Patch That Fixes a Bug?**
+
+  * Open a new GitHub pull request with the patch.
+    1. Fork this project
+    1. Create your feature branch: `git checkout -b my-new-feature`
+    1. Commit your changes: `git commit -am 'Add some feature'`
+    1. Push to the branch: `git push origin my-new-feature`
+    1. Submit a pull request via GitHub's web interface
+  * Ensure the PR description clearly describes the problem and its solution. Include the relevant issue number if applicable.
+
+#### **Do You Intend to Add a New Feature or Change an Existing One?**
+
+  * Suggest your change as a **new issue** using the label `enhancement`
+
+#### **Do you like PSICK?!?**
+
+  * Use it, improve it, share it
+  * Link, comment, post, talk about it :-)
+
+Thanks for contributing! :heart:
+