[RIP-9]Add the features of RocketMQ into the develop guide for users (#765)
[RIP-9]Add the features of RocketMQ into the develop guide for users (#765)

[RIP-9]Add the features of RocketMQ into the develop guide for users

DR-YangLong/RocketMQ,Vansee/RocketMQ,DR-YangLong/RocketMQ