Describe this plugin's purpose in the readme (#9)

README.md

@@ -1,2 +1,6 @@
 # CC Compat with WooCommerce
-Plugin to facilitate Classic Commerce compatibility for WooCommerce Addons
+Plugin to facilitate Classic Commerce compatibility with WooCommerce extension plugins.
+
+Some WooCommerce extensions check for an active plugin file named `woocommerce/woocommerce.php`, which doesn't work with Classic Commerce because the folder and the file have been renamed.
+
+This compatibility plugin may perform other duties in the future, but for now it just provides a file named `woocommerce/woocommerce.php` so that these extensions can work as expected.