Update config.lua

lua/gp/config.lua

@@ -6,6 +6,11 @@
 --------------------------------------------------------------------------------
 
 local config = {
+	-- Please start with minimal config possible.
+	-- Just openai_api_key if you don't have OPENAI_API_KEY env set up.
+	-- Defaults change over time to improve things, options might get deprecated.
+	-- It's better to change only things where the default doesn't fit your needs.
+
 	-- required openai api key (string or table with command and arguments)
 	-- openai_api_key = { "cat", "path_to/openai_api_key" },
 	-- openai_api_key = { "bw", "get", "password", "OPENAI_API_KEY" },