Merge pull request #32 from haggen/master

Add book How to Count under Numbers section

README.md

@@ -34,6 +34,7 @@ But knowing the stuff will help you become better! :muscle:*
 - :movie_camera: [UC Berkeley, Data Structures Course](https://archive.org/details/ucberkeley-webcast-PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd)
 
 ### Numbers
+- :book: [How to Count](https://www.goodreads.com/book/show/12093869-how-to-count)
 - :page_facing_up: [Floating Point Guide](http://floating-point-gui.de/)
 - :page_facing_up: [What Every Computer Scientist Should Know About Floating-Point Arithmetic](https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html#680)
 - :page_facing_up: [Basic Number Theory Every Programmer Should Know...](https://www.codechef.com/wiki/tutorial-number-theory/)