US: Ability to add bot to groups

[ivanleekk]

As a User, I want to add the bot to a group, So that I can split bills.

Acceptance Criteria:

• [x] Bot can be added to groups
• [x] Bot can be interacted with
• [x] Bot can receive information
• [x] Bot can send information

Definition of Done:

• [x] All acceptance criteria are met.
• [x] Code is reviewed and approved.
• [ ] Necessary tests are written and pass.
• [ ] Documentation is updated, if applicable.