Badge Request: GitHub projects

:clipboard: **Description**

I sow there's the GitHub's milestone completion badge #1209 , and it's a pretty cool one.
But i was wondering about a GitHub's project badge.

something like
- `projectname | 42%` cards completed for the whole project (might be of a green color)
- `projectname | 3 in progress` cards in progress, might have a purple background similiar to github's projects colors.
- `projectname | 8 columnName` or `projectname | columnName 7/10` cards completed in a single column
- `bug triage | 5 in review` the number of cards could go before the name, it reads better imo.

or generally inspired by the milestone's ones, since projects and milestones are similiar.

**Examples with static badges**

  

:link: **Data**

There are GitHub's APIs. I think for public repos it doesn't require an API key.
https://developer.github.com/v3/projects/

:microphone: **Motivation**

It would be nice for those who manage progress using github's projects.

Start with the GitHub Projects API documentation linked in the issue and compare its scope with the existing milestone completion badge (#1209). Before implementation, narrow the proposal to a specific project metric and badge format; done should mean that one defined metric can be retrieved and rendered reliably for supported public projects.

Written by the indexing model from the issue text.