added chatgpt plugin 'gp'

lua/plugins/gp.lua

@@ -0,0 +1,9 @@
+return {
+  "robitx/gp.nvim",
+  config = function()
+    require("gp").setup()
+    -- or setup with your own config
+    --  -- require("gp").setup(config)
+    --  -- you can set up shortcuts below
+  end,
+}