[redis] Updated the README file for the Redis workload to include initialization stuff.
[redis] Updated the README file for the Redis workload to include initialization stuff.

yungsters/rain-workload-toolkit,sguazt/rain-workload-toolkit,sguazt/rain-workload-toolkit,sguazt/rain-workload-toolkit,yungsters/rain-workload-toolkit,yungsters/rain-workload-toolkit