message: Add reference to GH to the extension readme
diff: @@ -164,3 +164,7 @@ If the `command` is set empty but no `% !TEX program` magic comment is found, `p
  ## License
  [MIT](https://opensource.org/licenses/MIT)
  +
  +## GitHub
  +
  +The code for this extension is available on github at: https://github.com/James-Yu/LaTeX-Workshop
  