Update README.md, centered screenshot!

I think screenshot is better when it is centered.
Merge pull request #85 from MaciejCzyzewski/patch-2

Update README.md, centered screenshot!
Update README.md
changed title
changed to h2
back to h1
added some images
proof of concept
fixed poc
fixed poc again - bg color
added more images. set up styles
added more images
added more images
style adjustments
fixed small image aarabi
more style fixes
fixed hamid
fixed more styles
something changed
Do these look like the faces of mercy?

(changed the "You Lose!" message)