Add toggle_background function and keymap

.config/nvim/lua/config/keymaps.lua

@@ -1,3 +1,16 @@
 -- Keymaps are automatically loaded on the VeryLazy event
 -- Default keymaps that are always set: https://github.com/LazyVim/LazyVim/blob/main/lua/lazyvim/config/keymaps.lua
 -- Add any additional keymaps here
+
+local Util = require("lazy.core.util")
+
+function toggle_background()
+  Util.info(vim.opt.background:get())
+  if vim.opt.background:get() == "dark" then
+    vim.opt.background = "light"
+  else
+    vim.opt.background = "dark"
+  end
+end
+
+vim.keymap.set("n", "<F5>", "<cmd>lua toggle_background()<cr>", { desc = "Switch between dark and light themes", noremap = true })