Update free-programming-books-ru.md

added nosql
[en] Adds "Neural Networks and Deep Learning"
Add "The PDL Book"
fix some link errors
Merge pull request #425 from mobi-soft/patch-1

Update free-programming-books-ru.md
Merge pull request #426 from jmromer/neural-networks-deep-learning

[en] Adds "Neural Networks and Deep Learning"
Merge pull request #427 from ericguirbal/en

Add "The PDL Book"
Merge pull request #428 from peonone/fix-link-error

fix some link errors
Added Vim Regular Expressions 101
Merge pull request #429 from katgironpe/master

Added Vim Regular Expressions 101
Add Number Theory
++Coq
new vim ressource
Fix typo
Merge pull request #430 from corburn/master

Add Number Theory
Merge pull request #431 from pirapira/master

++Coq
Merge pull request #432 from maieul/master

new vim ressource
Merge pull request #433 from jbochi/patch-1

Fix typo