Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to Contribute #
+
+## Tools required ##
+- Python 3.7.x or 3.8.x (3.8.x is highly recommanded and 3.9 is proscribed).
+- Pycharm or Visual Studio code IDE.
+- Git.
+- UI testing must be done using Chrome latest version.
+
+## Branching ##
+### Basic rules ###
+- master branch contains only stable releases (which have been merged to master) and is intended for end-users.
+- develop branch is the target for integration and is not intended for end-users.
+- `feature` is a temporary feature branch based on develop.
+
+### Conditions ###
+- master is not merged back to develop.
+- develop is not re-based on master.
+- all feature branches branch from develop only.
+- Bugfixes created specifically for a feature branch are done there (because they are specific, they're not cherry-picked to develop).
+- We will not release a patch (0.0.x) if a newer minor (0.x.0) has already been released.
+
+
+## Typical contribution workflow ##
+### Community devs ###
+- Fork the repository or pull latest changes if you already have forked it.
+- Checkout development branch.
+- Make the desired changes.
+- Submit a PR to Bazarr development branch.
+- Once reviewed, your PR will be merged using Squash and Merge with a meaningful message.
+
+### Official devs team ###
+- All commits must have a meaningful commit message (ex.: Fixed issue with this, Improved process abc, Added input field to UI, etc.).
+- Fixes can be made directly to development branch but keep in mind that a pre-release with a beta versioning will be created for every push you make.
+- Features must be developed in dedicated feature branch and merged back to development branch using PR.
+- Once reviewed, your PR will be merged using Squash and Merge with a meaningful message.