message: docs: add usage instructions
diff: @@ -30,3 +30,32 @@ The 'GitHub: Set Personal Access Token' should be executed for that.
  ![GitHub Personal Access Token](images/github-personal-access-token2.png)
  ![Set GitHub Personal Access Token](images/set-personal-access-token.png)
  +
  +## Usage
  +
  +### Create a new pull request
  +
  +1. Create a new local branch from the commit you wanted to start developing with
  +1. Do you code changes
  +1. Commit your changes
  +1. Push your changes to your remote
  +1. Then execute `Create pull request from current branch`
  +1. In the status bar you can then see the status of your created pull request and if you'd like to open it
  +
  +### Checkout pull request
  +
  +1. Execute `Checkout open pull request...`
  +1. Select a pull request from the list
  +1. The pull request is checked out and your working copy switches to that branch
  +
  +### Browser pull request
  +
  +1. Execute `Browse open pull request...`
  +1. Select a pull request from the list
  +1. Your default browser opens the pull request on github
  +
  +### Merge pull request
  +
  +1. Execute `Merge pull request (current branch)...`
  +1. Select your merge strategy from the shown list (merge, squash, rebase)
  +1. The pull request associated with your current branch is then merged
  