Add Comprehensive Free Resources for Algorithms and System Design. (#11494)

* Added a new book and some courses in english resources file. Algorithms book, system design and dsa courses

* Added a new book and some courses in english resources file. Algorithms book, system design and dsa courses

* Fix linter warnings by correcting blank line spacing in free-courses-ur.md

* Fix linter warnings by correcting blank line spacing in free-courses-ur.md again!

* Fix linter warnings by correcting blank line spacing in free-courses-ur.md again!!

* Changes as per contributing.md  made

* fixed line spaces

* hygiene check

* Changed resource location from courses to problem-sets-competitive-programming.md

courses/free-courses-ur.md

@@ -61,4 +61,3 @@
 
 * [Python](https://www.youtube.com/playlist?list=PL-vQNozaqIxuPzFUVEIrYDvd6ieUshJTw) - Kawish - Urdu
 * [Python_ka_chilla (python in 40 days in urdu/Hindi)](https://www.youtube.com/playlist?list=PL9XvIvvVL50HVsu-Ao8NBr0UJSO8O6lBI) - Codeanics
-  

more/problem-sets-competitive-programming.md

@@ -47,6 +47,7 @@
 * [Sigmageek](https://sigmageek.com)
 * [Sphere Online Judge](http://www.spoj.com/contests)
 * [Techgig](https://www.techgig.com)
+* [Top Array Interview Questions – Structured Path with Video Solutions \| Arrays Series](https://takeuforward.org/array/top-array-interview-questions-structured-path-with-video-solutions/)
 * [Top Coding Interview Problems](https://takeuforward.org/interviews/strivers-sde-sheet-top-coding-interview-problems/) - Striver
 * [Topcoder](https://www.topcoder.com)
 * [Toph](https://toph.co)
@@ -96,6 +97,7 @@
 * [C2 Ladders](https://c2-ladders-juol.onrender.com)
 * [Striver's A2Z DSA Course/sheet](https://takeuforward.org/strivers-a2z-dsa-course/strivers-a2z-dsa-course-sheet-2)
 * [Striver’s CP Sheet](https://takeuforward.org/interview-experience/strivers-cp-sheet/)
+* [System Design Roadmap with Videos for SDEs](https://takeuforward.org/system-design/complete-system-design-roadmap-with-videos-for-sdes/) - take U forward(takeuforward)
 
 
 ### Problem Sets