Feature request: add icons/badges for ranks

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

Instead of displaying ranks (such as A, A-, A+, ...) we can display rank's respective icon/badge.

### Describe the solution you'd like

We'll add unique icons for respective ranks and display them.
API change: `&rank_icon=badge`

### Additional context

I'll be grateful to discuss about the icons for the ranks.
Can also add different styles for badges.
`&rank_style={rankStyle}`

This could gamify the card.