Updating readme file

README.md

@@ -14,4 +14,11 @@ The repo is structured as follows:
   - /vr - implementation of viewstamped replication protocol
   - /ir - implementation of inconsistent replication protocol
 
--
+- /store
+  - /tapir - implementation of TAPIR designed to work with IR
+  - /occstore - implementation of an OCC-based 2PC transactional
+  storage system, designed to work with VR
+  - /lockstore - implementation of a strict two-phase locking 2PC
+  transactional storage system, designed to work with VR
+  - /qwstore - implementation of an eventually consistent storage
+    system, using quorum writes for replication