Docs update

[shark-h]

Please update the docs so that they're easy to understand and implement for beginners.

[coco98]

@shark-h Did you have any specific suggestions in this regard? I think one of the things to do was to create a sample app right?

[shark-h]

@coco98 Yeah, that would do.

[kshitij0704]

Sir, can you please add an example of signup method as well, it is not clear (being a beginner) what to pass as options in hasura.auth.signup