Add collections

[Mforcen]

In some cases, API targets contains a large number of endpoints, and allowing to store a set of request under the same file would be useful to navigate among the different endpoints. A tree explorer could be added to the left to change the current request in the workspace.

I could try to make a POC if you see that this requests fits with the project.

[danirod]

This is already in progress in #18, backed by issue #11. I'll be focusing on this next friday because it is stopping 0.2.0.

[Mforcen]

Yeah, I forgot to check, sorry for the noise. Thanks for the good work!

[danirod]

No worry! The noise still can say what's important and what the people is actually demanding 😄