Update README.md

[mart1435]

Added Side-channel attacks in the crypto section !

[qazbnm456]

Hi @mart1435, thanks for your contribution. There're a few things that need you to check:

1. We don't need the "Scroll To Text Fragment" part in the URL since the article is all about the side-channel attacks.
2. Please change the rear part of your text. It should be "Written by [...](...)" to give the credit to the original author.
3. Could you update other README files at the same time so as to keep them aligned?

Thank you. :)

[mart1435]

I think it's done, I hope i did good :D

[qazbnm456]

Ah, could you update these README files at once in a sole PR? Thanks!

[qazbnm456]

Close per 0643a30.