add ex-commands template

Author: chrisgrieser

plugin/ex-commands.lua

@@ -0,0 +1,5 @@
+-- vim.api.nvim_create_user_command(
+-- 	"PLACEHOLDER_plugin_name_short_capitalized",
+-- 	function() require("PLACEHOLDER_plugin_name_short").FUNCTION_NAME() end,
+-- 	{}
+-- )