Update README.md

Include links to underlying workload and a description of the HammerDB benchmark.

Author: grdumas

README.md

@@ -1,3 +1,7 @@
 # hammerdb
-Wrapper scripts for running hammerdb automatically.  These wrappers scripts may
+Wrapper scripts for running HammerDB automatically.  These wrappers scripts may
 be run from zathras or manually.
+
+Underlying workload: https://github.com/TPC-Council/HammerDB
+
+Benchmark description: HammerDB is the leading benchmarking and load testing software for the worlds most popular databases supporting Oracle Database, Microsoft SQL Server, IBM Db2, PostgreSQL, MySQL and MariaDB.