Adding new coding practice sites to readme

[skywalkerluc]

Given that we just got a few sites to practice code exposed at readme.md, create a PR to include some new websites. Please make sure that the site that you're adding is still active.

[rosetanya898]

Can i do it

[iamsandipanbera]

I have some good sites where i practice. Can i add?

[rosetanya898]

Please look into pull request #7

[skywalkerluc]

Yes, taking a look right now, @rosetanya898.

--

@iamsandipanbera feel free to add a PR for that

[iamsandipanbera]

Please take a look PR #9

[skywalkerluc]

Done, thanks!