Create CONTRIBUTING.md

Author: jaime-olivares

CONTRIBUTING.md

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+# Contributing
+
+Contributions are very welcome in this project.
+
+When contributing to this repository, .
+
+Things to consider:
+- Please first discuss the change you wish to make via an [issue](https://github.com/jaime-olivares/vscode-yuml/issues), before proposing a change
+- Do not cover two different topics in a single pull request
+- Do not change or add libraries or tools (either for development or production purposes) without previous consent
+- Do not change symbol names (methods, properties), even if you think they are correct or better
+- Leave the code clean and **be sure you are not altering the spacing of the source code files**
+
+Standard steps:
+- Fork this project in github and clone it in your local machine
+- Debug in Visual Studio Code, reviewing all the affected functionalities
+- Commit and submit a [pull request](https://github.com/jaime-olivares/vscode-yuml/pulls)