Add file preview feature

[rohithasrk]

In order to view a particular file, as of now we'll need to download it first. A file preview feature in the browser is something desirable.

[IHackPy]

I would like to participate on this issue

[rohithasrk]

Hi @himanshuawasthi95. Great. Did you setup the project locally?

[IHackPy]

issues arises while installing requirements-test.txt

[rohithasrk]

What are the issues that are arising?