Added Algorithms from Wikibooks (#2932)

* Updated Algorithms Section

* Reordered Alphabetically (Algorithms)

* add "Wikibooks" as author

I took a look at what our practice has been regarding labeling of wikibooks. I found all sorts of things. We've been adding a lot of authornames, especially when the title is generic and the author name helps to distinguish one book from another, and using "Wikibooks" as the "author" of these books feels appropriate. I will be adding a PR to make this a uniform practice.

free-programming-books.md

@@ -280,6 +280,7 @@
 
 * [A Field Guide To Genetic Programming](http://dces.essex.ac.uk/staff/rpoli/gp-field-guide/toc.html) - Riccardo Poli et al.
 * [Algorithmic Graph Theory](http://code.google.com/p/graphbook/)
+* [Algorithms](https://en.wikibooks.org/wiki/Algorithms) - Wikibooks
 * [Algorithms, 4th Edition](http://algs4.cs.princeton.edu/home/) - Robert Sedgewick and Kevin Wayne
 * [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)