Adding a readme file

README.md

+# TAPIR
+
+This repository includes code implementing several replicated and
+transactional key-value stores.
+
+The repo is structured as follows:
+
+- /lib - the transport library for communication between nodes. This
+  includes UDP based network communcation as well as the ability to
+  simulate network conditions on a local machine, including packet
+  delays and reorderings.
+
+- /replication
+  - /vr - implementation of viewstamped replication protocol
+  - /ir - implementation of inconsistent replication protocol
+
+-