Add freely available programming books

README.md

@@ -31,6 +31,7 @@ Repository | Description
 [Pcaptools](https://github.com/caesar0301/awesome-pcaptools) 						| Collection of tools developed by researchers in the Computer Science area to process network traces
 [Pentest](https://github.com/enaqx/awesome-pentest) 								| List of awesome penetration testing resources, tools and other shiny things
 [PHP Security](https://github.com/ziadoz/awesome-php#security) 						| Libraries for generating secure random numbers, encrypting data and scanning for vulnerabilities
+[Programming Books](https://github.com/EbookFoundation/free-programming-books)        | Freely available programming books
 [Reversing](https://github.com/fdivrp/awesome-reversing) 						| List of awesome reverse engineering resources
 [Sec Talks](https://github.com/PaulSec/awesome-sec-talks) 							| List of awesome security talks
 [SecLists](https://github.com/danielmiessler/SecLists) 								| Collection of multiple types of lists used during security assessments