Add list competitions and list clubs

[manypozo]

Hi, thank you very much for making this. There are many tools out there, this I think this looks fresh and pretty useful!

What do you think about adding these two endpoints?

• GET competitions/ -> this can return all competition names, useful to deep dive into them later on
• GET clubs/ -> pretty much the same here

By adding these two endpoints I think the value of this app increases quite a lot