developer guides: async messaging

Best practices of asynchronous messaging implementation

Signed-off-by: Michal Wasko <michal.wasko@intel.com>

Author: mwasko

architectures/firmware/sof-zephyr/mpp_layer/async_messaging.rst

@@ -22,6 +22,8 @@ Asynchronous messages are one-way from producer to all consumers and allows to:
 Messages are exchanged over IDC protocol and shared memory with multi-core
 support. Message producers and consumers can be run on different cores.
 
+Development guide: :ref:`async_messaging_best_practices`
+
 .. TODO: Add link to AMS interface generated from code
 
 Asynchronous Messaging Flows