Package request: Jetbrains Mono

**Project description**
There is a new programming font with ligatures in town, from the people at Jetbrains, known for their IDE's. I have a sneaking suspicion that this is going to be very popular very soon.

**Metadata**

* homepage URL: https://www.jetbrains.com/lp/mono/
* source URL: https://github.com/JetBrains/JetBrainsMono
* license: Apache 2+
* platforms: All(?)