Created WooCommerce Git Flow (markdown)

WooCommerce-Git-Flow.md

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+For core development, we use the following structure and flow.
+
+![Git Flow](https://github.com/woocommerce/woocommerce/wiki/images/flow.png)
+
+## Branches
+
+* **Master** is the branch for all development and should always be the target of pull requests.
+* Each major release has a release branch e.g. `release/3.0`.
+* Fixes are applied to master, and then **cherry picked into the release branch if needed**.
+* Features that are not for the next release (for major, when next is minor) get labelled 'major' and are left as PRs. They can be approved however.
+* Tags get created from release branches when ready to deploy.
+
+## Branch naming
+
+Prefixes determine the type of branch, and include:
+
+* fix/
+* feature/
+* add/
+* update/
+* release/
+
+When creating a **fix branch**, use the correct prefix and the issue number. Example:
+
+```
+fix/12345
+```
+
+Alternatively you can summarise the change:
+
+```
+fix/shipping-tax-rate-saving
+```