cassandra: Add README

Add README for user to get started more easily.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Drop files option in cassandra/Capstanfile

Signed-off-by: Asias He <asias@cloudius-systems.com>
Add Capstanfile for tomcat

Signed-off-by: Asias He <asias@cloudius-systems.com>
Add Capstanfile for leveldb

Signed-off-by: Asias He <asias@cloudius-systems.com>
Add Capstanfile for memcached

Signed-off-by: Asias He <asias@cloudius-systems.com>
Add Capstanfile for sqlite

Signed-off-by: Asias He <asias@cloudius-systems.com>
Add Capstanfile for redis

Signed-off-by: Asias He <asias@cloudius-systems.com>
Add Capstanfile for netperf

Signed-off-by: Asias He <asias@cloudius-systems.com>
Add Capstanfile for iperf

Signed-off-by: Asias He <asias@cloudius-systems.com>