User manual for GrimoireLab 2.x

[sduenas]

First version of the GrimoireLab user's manual. The idea is to add the tutorial to this manual.

[thakkardhruvi205]

Hi, I’m Dhruvi
I’m a B.Sc. Data Science student and a new contributor to CHAOSS.
I’d like to help with the GrimoireLab 2.x user manual, especially by improving documentation or adding examples.
Could you please guide me on where I should start?