Added "Programming in Standard ML, Draft"

free-programming-books.md

@@ -128,6 +128,7 @@
 * [Smalltalk](#smalltalk)
 * [SQL (implementation agnostic)](#sql-implementation-agnostic)
 * [SQL Server](#sql-server)
+* [Standard ML](#standard-ml)
 * [Subversion](#subversion)
 * [Tcl](#tcl)
 * [Teradata](#teradata)
@@ -1354,6 +1355,10 @@ See also [TeX](#tex)
 * [SQL Server Stumpers Vol.5](http://www.red-gate.com/community/books/sql-server-stumpers-v5.htm) *(RedGate, By SQLServerCentral Authors)*
 * [Mastering SQL Server Profiler](http://www.red-gate.com/community/books/mastering-sql-server-profiler.htm) *(RedGate, By Brad McGehee)*
 
+###Standard ML
+
+* [Programming in Standard ML, Draft](http://www.cs.cmu.edu/~rwh/smlbook/) - Robert Harper
+
 
 ###Subversion
 * [Subversion Version Control](http://www.phptr.com/content/images/0131855182/downloads/Nagel_book.pdf) (PDF)