Count-Min Sketch creation, ingestion, and querying command examples

[filipecosta90]

Sample example that can be used as reference:
https://github.com/RedisBloom/redisbloom-go/blob/master/example_client_test.go#L11

Further reference for commands:
https://oss.redislabs.com/redisbloom/CountMinSketch_Commands/

to check locally the documentation effects

# start http service 
godoc -http=:6060

# open browser tab with
http://localhost:6060/pkg/github.com/RedisBloom/redisbloom-go/