Update readme.md

readme.md

 # PCheck
-A type-aware fault injection framework to fingerprint PFS checker policies.
+A type-aware fault injection framework to fingerprint PFS checker policies (PDSW'20). 
+In this repository we mainly provide:
+(1) Aged mini disk images from Lustre and BeeGFS nodes.
+(2) Bash files & iscsi tool (modified) to create a Lustre/BeeGFS cluster with a host machine.
+(4) The aging workload we mentioned in the paper.
+(3) Several hardcoded faults described in the paper.
+Fault injection and the experimental results judgement still heavily rely on manual effort at this point. 
+The automation will come soon.
 
 ## README
 This repository contains the source code for "Fingerprinting the Checker Policies of Parallel File Systems".