Add interactive football pitch example

[seidlr]

Added my interactive football pitch voila example.

[jtpio]

Thanks @seidlr, I remember you shared it on Gitter too!

It looks like the repo has both an environment.yml and a requirements.txt files with the same dependencies. Maybe worth only keeping environment.yml to keep things simple and avoid confusion?

[jtpio]

Also we are looking into getting one more change in before adding new examples to the gallery.

[seidlr]

I could delete the file but I think the requirements.txt was needed for heroku deployment. Is it possible to add a reference to a branch in gallery.yaml?

[yuvipanda]

If you have both files, repo2docker will only count the environment.yml file, so I think it's ok...

[jtpio]

Ah ok, then it makes sense to keep both for Heroku.

[jtpio]

Thanks @seidlr!