Query Information about specific GitHub Repo

[HaRo87]

Hey @julien040, first things first: I really love your project, kudos! I want to use your GitHub Plugin to query general information about a single repository which can be provided as an argument. I would be willing to contribute this if that would work for you. From what I understood from your contribution guidelines, this shouldn't be an issue. I would use plugins/github/repoListByUser.go as a reference for the implementation. I just wanted to check with you first before starting to contribute, if that would work for you.

Keep up the good work.

Cheers, Robert