[Feature]: Bot Should Provide A List Of Recommended Channels to Users

### Contact Details

_No response_

### The Problem

Newcomers should be able to get a list of recommended channels to join.

### How to Fix It

## Possible Solutions
- Use a keyword. for example, if a user types "help" in a channel, they get a message from the bot with the list of channels.
- Use Slash commands to send a message to the User on request. [Refer to Bolt documentation](https://slack.dev/bolt-js/concepts).

### Additional Context

_No response_

### Specific File Path(s) on the Repo to be Modified/Refered to

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

No repository file or test is identified. Start with the Bolt documentation linked in the issue and compare the keyword and slash-command options; done means the bot provides newcomers with a list of recommended channels on request.

Written by the indexing model from the issue text.