Add CustomTkinter

[s1591]

What is this Python project?

CustomTkinter is a modern UI library based on tkinter

Features

• Can be used along side with tkinter
• Respects OS appearance(can be adjusted manually too)
• Has support for HighDPI scaling on windows and macos
• Consistent look across all OS
• Anyone with basic tkinter knowledge can easily use this

What's the difference between this Python project and similar ones?

tkinter is very easy to learn without the steep learning curve that comes with other GUI frameworks,being based on tkinter and without the ugly windows I think CustomTkinter is awesome and belongs here :cake:

I dont know deleting a fork would delete its pending pull request too.So I opened again,sorry!