Add description attribute for routes / variants

[timderspieler]

Is your feature request related to a problem? Please describe.
Currently it is not possible to get more information about a route besides the name, method and available variants.

Describe the solution you'd like
I would like to have an attribute below the route id / variant id to give a brief description on what the route / the variant does.

Describe alternatives you've considered
/

Additional context
On top of that it would be awesome to have an admin api method to get the description of a route / variant.