Just clone the repo, run npm install and then grunt.
The login flow involves scanning a barcode with the WeChat mobile app - this authorizes your computer to be logged in (as with the web client).
- When you login you may see a "File Transfer" chat in your mobile client - this is due to how the login process is handled. This chat can be ignored.
- You can use your phone to de-authorize the session, which will of course cause whatever application on your computer that depended on it to stop working.