Implement /rush00 command

[tanamaroby]

Issue Title: Implement /rush00 Command

Issue Description: As a user of our Discord bot, I want to be able to use a "/rush00" command to generate a square pattern based on a given input number, so that I can create visual representations within Discord.

Feature Description:

• The "/rush00" command should take one argument, which is a number representing the size of the square.
• When invoked, the bot should generate a square pattern with the specified size.
• The square pattern should consist of characters representing the corners, edges, and interior of the square, with spaces in between.
• The bot's response should include the generated square pattern.

Acceptance Criteria:

• The "/rush00" command is successfully implemented and tested.
• Invoking the "/rush00" command with a valid number argument should result in the bot generating and displaying a square pattern with the specified size.
• The bot's response should include the generated square pattern.

Additional Notes:

• This feature will provide users with a way to visualize square patterns within Discord.
• Please ensure thorough testing of the "/rush00" command functionality before closing this issue.