DOC: Add section of installation from source

[taranjeet]

Issue with current documentation:

for development, one need to install package in an editable format. Currently the documentation for this is missing. we need to add it. we also need to figure out a relevant section for this in the doc or create new one if it doesn't exist.

[ShatilKhan]

Hi, please assign me this issue

[ShatilKhan]

@taranjeet

[poojatalele]

hey @taranjeet , I would like to work on this issue, kindly assign