add personalize mappings and plugins

lua/custom/plugins/copilot.lua

@@ -0,0 +1,9 @@
+-- You can add your own plugins here or in other files in this directory!
+--  I promise not to create any merge conflicts in this directory :)
+--
+-- See the kickstart.nvim README for more information
+return {
+  'github/copilot.vim',
+  config = function()
+  end,
+}