fix: select range function by nvim version and do not highlight a single character

fix: module table should be local

Update README.md

Remove demo.svg (it block loading this page in mobile)

Add an autocmd for ModeChanged to update selected regions when cursor does not move (e.g. `V:`, `v` -> move -> `C-v`)

Update README.md

Add hl_priority option to set the priority of the highlight

Set plugin event as VeryLazy

Slightly improve README

Improve demo (disable which-key for clearer view)

Add README and demo

Add .gitignore

Add plugin logic

Add .stylua.toml

Create LICENSE