Getting started with the VSIX

1. Install latest VS Code Insiders
2. install the vsix from https://github.com/Microsoft/vscode-pull-request-github/releases/tag/v0.0.1
3. Reload VS Code after the installation (click the reload button next to the extension)
4. Exit VS Code.
5. Start VS Code Insiders from command line with flag: code-insiders --enable-proposed-api Microsoft.vscode-pull-request-github
6. You should be good to go!