Add HPC materials from LLNL

free-programming-books.md

@@ -237,6 +237,7 @@
 ####Parallel Programming
 * [How to Write Parallel Programs](http://www.lindaspaces.com/book/)
 * [High Performance Computing](http://cnx.org/content/col11136/latest) (PDF, ePUB) - Charles Severance & Kevin Dowd
+* [High Perofrmance Computing Training](https://computing.llnl.gov/?set=training&page=index) (LLNL materials)
 * [Is Parallel Programming Hard, And, If So, What Can You Do About It?](http://kernel.org/pub/linux/kernel/people/paulmck/perfbook/perfbook.html)
 * [Introduction to Parallel Computing](https://computing.llnl.gov/tutorials/parallel_comp/) - Blaise Barney
 * [Programming on Parallel Machines; GPU, Multicore, Clusters and More](http://heather.cs.ucdavis.edu/parprocbook) - Norm Matloff