Add arttime

[poetaman]

arttime: 🧜🏼‍♀️ beauty of text art meets functionality of clock / timer / pattern-based time manager ⏰ in terminal

Checklist for submitting a pull request to Terminals Are Sexy:

• I have carefully read and comply with the Contributing Guidelines of this repo.
• I have searched the PRs of this repo and believe that this is not a duplicate.

• Title: arttime
• Link: https://github.com/reportaman/arttime
• Category: Tools and Plugins
• Description: Beauty of text art meets functionality of clock, timer, pomodoro++ time manager.