Download and other badges like spiget or ore

[AlexProgrammerDE]

I think it would be a good idea to make use of the API and make badges. Spigotmc and ore already have badges on shields.io called spiget and ore. I think this would be a nice feature to add for hangar so i see three options here:

1. Make our own badges generator using spring.
2. Use the shields.io json parser and make custom badges based on the API.
3. Make a PR to shields.io to add hangar abd maybe a custom url option for other hangar instances.

I think the third way is the easiest and most likely the best way, but it probably depends on their badge adding requirements.