Update README.md

Author: katilp

README.md

@@ -4,6 +4,8 @@ Run this test in CMS Open Data VM [http://opendata.cern.ch/VM/CMS/2011]
 cmsrel CMSSW_5_3_32
 cd CMSSW_5_3_32/src
 cmsenv
+mkdir WorkDir
+cd WorkDir
 git clone https://github.com/cms-opendata-validation/recotest.git
 
 cd recotest