Adding CONTRIBUTING.md

Author: David-Desmaisons

CONTRIBUTING.md

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+## How to contribute to vue.draggable
+
+### **Did you find a bug?**
+
+* **Ensure the bug was not already reported** by searching on GitHub under [Issues](https://github.com/SortableJS/Vue.Draggable/issues).
+
+* **Check if you are using the last version of vue.draggable and a compatible version of Sortable** (as indicated in the [README section](./README.md))
+
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/SortableJS/Vue.Draggable/issues/new). Be sure to respect issue template including a **title and clear description**, as much relevant information as possible, and a [**jsfiddle**](http://jsfiddle.net/) (or similar online tool) containing an sample demonstrating the bug. Explain the **step by step scenario** as well as the **actual result** as opposed as the **expected result**.
+
+#### **Do you have questions about how to use vue.draggable?**
+
+* Check [README section](./README.md) section as well as [Issues](https://github.com/SortableJS/Vue.Draggable/issues) to see if a similar question has been asked and answered.
+
+* Check [Sortable](https://github.com/RubaXa/Sortable) documentation.
+
+* DO NOT OPEN ISSUE. Ask a question on [stackoverflow](https://stackoverflow.com) instead to get answer from the vue fantastic community.
+
+### **Did you write a correction that fixes a bug?**
+
+* Open a new GitHub pull request with the code.
+
+* Ensure the PR description clearly describes the problem and solution. Include the relevant issue number if applicable.
+
+### **Do you intend to add a new feature or change an existing one?**
+
+* Open an issue proposing the enhancement explaining the rational and the added value.
+
+* Once agreed you may submit the corresponding PR.
+
+Thanks!