Added Kitty terminal emulator

[bdmorin]

Added Kitty, pretty much the same thing as Alacritty, but ready to go on multiple platforms.

Checklist for submitting a pull request to Terminals Are Sexy:

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

- **kitty**:

• https://sw.kovidgoyal.net/kitty/:
• Terminal Emulation Applications:
• the fast, featureful, GPU based, terminal emulator:

[bdmorin]

apparently I didn't see someone already submitted kitty, my bad. I'll delete.

[DArtagan]

@k4m4 May we resuscitate this pull-request? The kitty they're talking about here still isn't included.

Confusingly, there is:

• "KiTTY" (included in the list): Fork from version 0.70 of PuTTY.
• "kitty": Cross-platform, GPU-accelerated terminal emulator.

It would be could to include the latter as well.

[k4m4]

@DArtagan, thank you for mentioning this. @bdmorin, could you please squash the two commits into one? Thanks.

[k4m4]

Closing due to inactivity.

[okkdev]

still missing...