Change test file name
Add test for Tame (to fail)
Add skel of `Group`
Add `Group.Count`
Change method name
Fix typo
Add test for Tame (to fail)
Improve error handling, avoiding `panic`
Add new command `ZADD` to protocol/redis
Use `ZADD` of redis when `Group.Add`
Add `ZCOUNT` command in redis protocol (still fail)
[wip] zadd