Contribution: Add Linux router with FRR to vrnetlab

[blinklet]

I'd like to add a Linux router to vrnetlab so we have more options fore open-source software in vrnetlab virtual networks. I propose to integrate Brezular's tinyCORE linux router with FRR. I will create a new Docker container directory based on the files in the OpenWRT directory, with some modifications.

I read your contribution guide and it suggests posting a contribution proposal before implementing it. So, what do you think?

[plajjan]

So so sorry for such late feedback (sorting github notification emails to separate folder means I haven't seen them).

Please, feel free to add this. Sounds like a great addition! :)