Start and stop command
As a User, I want a standard way to subscribe and unsubscribe to the bot's services (and delete my data) so I can define when it can interact with me and when it can't, without the need to block it.
As a User, I want a standard way to subscribe and unsubscribe to the bot's services (and delete my data) so I can define when it can interact with me and when it can't, without the need to block it.