added overseer keybinding

lua/setup/my_overseer.lua

@@ -1,3 +1,9 @@
-require("overseer").setup({
+local overseer = require('overseer')
+overseer.setup({
   templates = { "builtin", "user.cmake.cmake" },
 })
+
+vim.keymap.set({ 'n', 'x' }, '<F4>', function()
+  overseer.open()
+  overseer.run_template()
+end, opts)