New project: ProveIt gadget

It seems this is tracked in Phabricator:T149177, where verification has been done.

Next step is to create a patch as documented in Setup of a new project. Feel free to attempt to create such patch, I will review it. If you can't do it, we will do it at some point. Just let us know.

Nike (talk)‎

Thanks! Patch submitted at https://gerrit.wikimedia.org/r/#/c/347791/

Felipe (talk)‎