Add 7.6 Release Notes

Author: jkmassel

WooCommerce/Resources/release_notes.txt

@@ -1,5 +1,3 @@
-- [x] Show an improved error modal if there are problems while selecting a store. [https://github.com/woocommerce/woocommerce-ios/pull/5006]
-- [***] Shipping Labels: Merchants can now add new custom and service packages for shipping labels directly from the app. [https://github.com/woocommerce/woocommerce-ios/pull/4976]
-- [*] Fix: when product image upload fails, the image cell stop loading. [https://github.com/woocommerce/woocommerce-ios/pull/4989]
-
+Merchants using the WooCommerce Shipping & Tax Extension will find creating custom packaging for a shipping label is now a breeze! Creating and printing shipping labels from your mobile device is so much fun!
 
+We also fixed and improved a bunch of little things in the app based on your feedback.