[Plugin] Support auto close brackets pairs

[NNBnh]

As the title suggests!

Links that might be useful:

• Kakoune's auto-pairs.kak plugin
• Neovim-Lua wishlist about "Auto close brackets pairs"

[vamolessa]

Could you achieve what you're after with this snippet?

map insert "(" "()<left>"
map insert "[" "[]<left>"
map insert "{" "{}<left>"
map insert "'" "''<left>"
map insert '"' '""<left>'
map insert "`" "``<left>"

I've also added it to config_recipes.md.

[NNBnh]

That is a simple solution, but still lack many features like:

• Auto delete the closing bracket when the cursor is in the middle of an empty brackets pair with Backspace (e.g: foo{|}bar => foo|bar where | is the cursor).
• When pressing a closing bracket, if the cursor is inside a brackets pair and at the left of a closing bracket, move the cursor to the right of the closing bracket instead of insert a new closing bracket (e.g: "foo bar|" => "foo bar"| where | is the cursor).
• Enable/disable brackets based on language/file format.
  ...

Now thinking again, I think this should be implemented through plugin. When Pepper add support for plugin, I will definitely try to implemented this.