[FEATURE] Add Easter Eggs to the Tethys CLI

[swainn]

Is your feature request related to a problem? Please describe.
The Tethys commandline interface (CLI) is boring, it needs fun easter eggs to make it more exciting.

Describe the solution you'd like
Examples of easter eggs could include:

• Hidden commands that print ASCII art or other fun messages.
• Add ASCII art logo to the header when Tethys starts up.
• Play a sound or 8-bit song
• Tell a knock-knock joke or similar

Describe alternatives you've considered
Here are some ideas from popular Linux CLIs: https://contabo.com/blog/top-10-linux-easter-eggs/

Additional context
N/A

[swainn]

NOTE: This is an issue for the new contributor tutorial. Please, don't close.