Add screenshots

[vipulgupta2048]

@quozl I think this is ready to go as well. Can you review?

[quozl]

@vipulgupta2048, thanks, this repository was not on my watch list, so I was not notified. Fixed.

@sdziuda, thanks. I've squashed your commits, noticed again your mixed use of tabs and spaces in description, and rewrote it. Pushed as 006e376730ce3c521da82702a0920cac32279e74. For future pull requests, may I suggest;

• use commit messages to explain what the problem is you are solving, and how you are solving it,
• install git on your computer and use it there, in order to;
  • rewrite your changes without having to add more commits,
  • rewrite your commit messages, and
  • use a real mail address in your commits (currently a noreply.github address is used),
• use a text editor or development environment that shows the difference between spaces and tabs; my favourite is emacs, but there's also atom, and plenty more.

[vipulgupta2048]

Thanks @quozl for the same :hatching_chick: