chore: create ISSUE template

[mikesmithgh]

bugs:

Steps: Run :KittyScrollbackCheckHealth

If :KittyScrollbackCheckHealth fails, please provide

• Kitty version
• Neovim version

Questions:

• [ ] Are you running within a terminal multiplexer (.e.g, tmux, screen). If so, which one?

  • [ ] tmux
  • [ ] screen
  • [ ] other (please specify)

• What shell are you using? (e.g., bash, ksh, fish, nushell, etc)

• What version of the shell? // TODO: possible add this to KittyScrollbackCheckHealth