Add `go` client

[pieroit]

There is a new client for go created by @saniales: https://github.com/saniales/ccat-api

Let's add it to the list of clients ;)

[saniales]

Wait, I still need to find the best name, therefore repo name might change!

[saniales]

Ok you can leave it as is.

Let me transfer the property to the org then we can add the related docs

[pieroit]

Sorry it is still not added Documentation lags a little :)

There is no need to transfer, up to you!

[pieroit]

Done