Add ImJimmi's Contrast bundle to sites list

[ImJimmi]

Add your repo!

To get it merged quickly, please check:

• [x] You modified sites.txt, not README.md (which is auto-generated each night)
• [x] You provided the full url, ala https://github.com/myname/myrepo with no trailing slash at the end of the url
• [x] The description is short n' sweet
• [x] There's no period on the end of the description
• [x] You didn't add extra newlines

You can add a gitlab or other url, but only github repositories currently show stars and licenses.

[sudara]

Thanks!!