Added books in Algorithms and Competitive Programming (#3982)

* Added books in Algorithms and Competetive Programming

* Resubmitting PR with requested changes

free-programming-books.md

@@ -315,6 +315,7 @@
 * [Algorithms and Automatic Computing Machines (1963)](https://archive.org/details/Algorithms_And_Automatic_Computing_Machines) - B. A. Trakhtenbrot
 * [Algorithms and Complexity](https://www.math.upenn.edu/~wilf/AlgoComp.pdf) - Herbert S. Wilf (PDF)
 * [Algorithms Course Materials](http://jeffe.cs.illinois.edu/teaching/algorithms/) - Jeff Erickson
+* [Algorithms Notes for Professionals](https://goalkicker.com/AlgorithmsBook) - Compiled from StackOverflow Documentation (3.x) (PDF)
 * [Analysis and Design of Algorithms](http://www.cse.iitd.ernet.in/~ssen/csl356/admin356.html) - Sandeep Sen, IIT Delhi
 * [Animated Algorithm and Data Structure Visualization](http://visualgo.net) (Resource)
 * [Annotated Algorithms in Python: Applications in Physics, Biology, and Finance](https://github.com/mdipierro/nlib) - Massimo di Pierro
@@ -379,6 +380,7 @@
 
 * [Competitive Programmer's Handbook](https://cses.fi/book.html) - Antti Laaksonen (PDF)
 * [Competitive Programming, 1st Edition](https://cpbook.net/#CP1details) (PDF)
+* [Principles of Algorithmic Problem Solving](http://www.csc.kth.se/~jsannemo/slask/main.pdf) - Johan Sannemo (PDF)
 
 
 #### Compiler Design