added contributing guidelines

Author: mawassk

CONTRIBUTING.md

@@ -0,0 +1,10 @@
+# Contributing
+For any kind of issue (**bug** report, **feature** request, **question**) feel free to **open an issue**. Before creating an issue search for related issues to prevent **duplicates**.
+
+## Contributing Code
+- Fork this repository
+- Create a **topic branch** with a short and describing name for your contribution
+- Add code to your branch
+- Create a **Pull Request**
+
+Please refer to any related issues in your Pull Request. For bigger changes you should first create an issue.