+Branches documentation

BRANCHES.md

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+# Branches
+
+## Main
+
+There is one main branch where most work ends up. Right now the name of that branch is master.
+
+This means that you generally want to target this branch when contributing to F#+.
+
+## V1
+
+For the v1 release we have the following branches:
+
+- [v1.1](https://github.com/fsprojects/FSharpPlus/tree/v1.1) containing the release branch for 1.1.* releases.
+- [v1.2](https://github.com/fsprojects/FSharpPlus/tree/v1.2) containing the release branch for 1.2.* releases.
+- [v1.3](https://github.com/fsprojects/FSharpPlus/tree/v1.3) release branch for 1.3.* releases. Note that this branch contains a merge from master instead of using cherry picking. This means that some of the changes in master have been **reverted** to avoid breaking changes.
+- [v1.4](https://github.com/fsprojects/FSharpPlus/tree/v1.4) release branch for 1.4.* releases.
+- [v1.5](https://github.com/fsprojects/FSharpPlus/tree/v1.5) release branch for 1.5.* releases. Note that we have done experiments to change the target framework net45 to net462 and found that it would be [a breaking change](https://github.com/fsprojects/FSharpPlus/tree/v1.5-net462-instead-of-net45).
+- [v1.6](https://github.com/fsprojects/FSharpPlus/tree/v1.6) release branch for 1.6.* releases.
+
+