[nvim] Add toggleterm plugin.

nvim/dotfiles/plugins-list.vim

@@ -8,6 +8,7 @@ let s:ctx = g:dotfiles_plugins_list_context
 " Files {{{
   call s:ctx.use('preservim/nerdtree')
   call s:ctx.use('kyazdani42/nvim-web-devicons')
+  call s:ctx.use('akinsho/nvim-toggleterm.lua')
 " }}}
 
 " Language specific {{{

nvim/plugin/toggleterm.lua

@@ -0,0 +1,4 @@
+require("toggleterm").setup{
+  size = 15,
+  open_mapping = [[<C-\>]],
+}