The bot only has one feature and it's to start voice channel activities.
To not make things hard for the user the bot uses / commands which can easialy be used inside discord.
The command is:
/activity <voice channel> <type of activity>
The bot will send the message privatly in the chat (ephemeral) and will have 2 buttons. One is for joining the activity and the second button is for inviting the bot to a server.