add docs for managing branches

Author: Meaghan Lewis

docs/using/images/branches-initial-view.png

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+# Managing branches
+
+Initial **Branches** view
+<img src="images/branches-initial-view.png" alt="Post commit view"/>
+
+## Create branch
+
+1. From the **Branches** view, click on `master` under local branches to enable the `New Branch` button and be able to create a new branch from master.
+2. Click on `New Branch`.
+<img src="images/create-new-branch-view.png" alt="Post commit view"/>
+
+3. Enter a name for the branch and click `Create`.
+<img src="images/name-branch.png" alt="Post commit view"/>
+
+4. The new branch will be created from master.
+<img src="images/new-branch-created.png" alt="Post commit view"/>
+
+## Checkout branch
+
+1. Right-click on a local branch and select `Switch` or double-click on the branch to switch to it.
+<img src="images/switch-or-delete.png" alt="Post commit view"/>
+
+2. A dialog will appear asking `Switch branch to 'branch name'?`. Select `Switch`.
+<img src="images/switch-confirmation.png" alt="Post commit view"/>
+
+The branch will be checked out.
+<img src="images/switched-branches.png" alt="Post commit view"/>
+
+## Delete branches
+
+1. Click on the branch name to be deleted and the `Delete` button becomes enabled.
+2. Right-click on a local branch and select `Delete` or click the `Delete` button above the Local branches list.
+<img src="images/switch-or-delete.png" alt="Post commit view"/>
+
+3. A dialog appears asking `Are you sure you want to delete the branch: ‘branch name’?`. Select `Delete`.
+
+The branch will be deleted.