Add PracHub to Practice questions

Author: fieldkiller

README.md

@@ -158,6 +158,7 @@ Keep each story to ~2 minutes, with measurable outcomes.
 - [Exercism](https://exercism.org/)
 - [NeetCode problem roadmap](https://neetcode.io/roadmap)
 - [Project Euler](https://projecteuler.net/)
+- [PracHub](https://prachub.com)
 
 ## Videos