[FR]: description for scnvim.map keymaps

[salkin-mada]

the keymaps set with the convenience method mapprovided by scnvimhas no desc option. This "masks" or hides the intent of the mapping from keymap lookup either via plugins like WhichKey or simply by straight up fzf'ing the loaded keymaps on a session and/or buffer. what we need is vim.keymap.set desc=