Merge pull request #2 from datanerds-io/feature/readme

Add a readme.

Author: larsp

README.md

@@ -0,0 +1,9 @@
+# About
+
+LACK is a consensus library based on the Cassandra database system. See [here](http://www.datastax.com/dev/blog/consensus-on-cassandra) for details on its implementation.
+
+# Build
+
+Make sure that a Cassandra database is running and the keyspace `lack` exists.
+
+Then run `gradle build`.