Add card to show amounts of commits over time (Graph)

**Is your feature request related to a problem? Please describe.**

**Describe the solution you'd like**
It would be nice, if the API could offer a card to display the amounts of commits made over a specific period of time, like the last month or last year.

The graph should, if possible, display the stats as either a line-graphic or as a bar graphic.

I hope this is somehow doable with what GitHub offers.

**Describe alternatives you've considered**

**Additional context**