Create contributing.md

Author: yaira2

contributing.md

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+# Quick guide for the process we use on GitHub
+
+There are two main branches in the Files UWP reposistory,
+- Master
+- Develop
+
+### Master
+`Master` is the stable branch, this has the code for the latest release in the Microsoft Store. Only pull requests from the `develop` branch will be merged in here.
+
+### Develop
+`Develop` is the development branch which includes all the latest changes from Files UWP, beta builds will be released from this branch. Once `develop` is found to be stable then it will be merged in to `master`.
+
+### Other branches
+There are other branches as well in the Files UWP repository, these are usually for new features or changes that are still a work in progress and not yet ready to be merged in to `develop`. These branches are temporary and will be removed once the changes are merged in to `develop`.
+
+
+## Contributing to Files UWP
+
+To get started, create a fork of the repository on GitHub. You will need to do that to make any changes since the Files UWP repo is restricted to a few contributors of the app. If you decide to make a change you should always do it on the `develop` branch. Once your change is completed you can open a pull request which we will review and if we like it we will merge it in 😀
+
+#
+If you have any questions or feedback make sure to open an issue here.