DISCLAIMER: not very thoroughly tested, may or may not successfully work

to run on your own machine:

create secret.py file, and put

SLACK_BOT_TOKEN = <your Slack app token>
SLACK_SIGNING_SECRET = <your Slack app signing secret>
TBA_API_KEY = <your API key>

slack app required scopes:

chat:write
commands
groups:history
im:history
mpim:history
channels:history
users.profile:read

slack app required bot events to subscribe to:

message.channels
message.groups
message.im
message.mpim

commands to implement:

/team_info
/new_game
/join_game
/end
/game_list
/start