Added COBOL section with 2 PDFs

free-programming-books.md

@@ -32,6 +32,7 @@
 * [C](#c)
 * [C++](#c-1)
 * [Clojure](#clojure)
+* [Cobol] (#cobol)
 * [CoffeeScript](#coffeescript)
 * [ColdFusion](#coldfusion)
 * [Coq](#coq)
@@ -438,6 +439,10 @@
 * [Clojure Koans](http://clojurekoans.com/)
 
 
+###COBOL
+* [COBOL Programming Fundamental] (http://ibmtc.hust.edu.cn/zos-cobol/cobol/resource/COBOL_Programming_Fundamental.pdf) (PDF)
+* [Open COBOL 1.1 - Programmer's Guide] (http://opencobol.add1tocobol.com/OpenCOBOL%20Programmers%20Guide.pdf) (PDF)
+
 ###CoffeeScript
 * [Smooth CoffeeScript](http://autotelicum.github.com/Smooth-CoffeeScript/SmoothCoffeeScript.html)
 * [The Little Book on CoffeeScript](http://arcturo.github.com/library/coffeescript/)