add mapping for toggle term

lua/plugins/term.lua

@@ -0,0 +1,18 @@
+if true then return {} end
+
+---@type LazySpec
+return {
+  "akinsho/toggleterm.nvim",
+  config = function(plugin, opts)
+    require("toggleterm").setup {
+      -- size can be a number or function which is passed the current terminal
+      size = function(term)
+        if term.direction == "horizontal" then
+          return vim.o.lines * 0.4
+        elseif term.direction == "vertical" then
+          return vim.o.columns * 0.4
+        end
+      end,
+    } --[[@type ToggleTermConfig]]
+  end,
+}