doc: kernel: add documentation for queues

Add missing introduction to queues which are basically FIFOs and in
zephyr are used to implement both FIFO and LIFO objects.

Fixes #35199

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

doc/reference/kernel/data_passing/queues.rst

@@ -3,6 +3,12 @@
 Queues
 ######
 
+A Queue in Zephyr is a kernel object that implements a traditional queue, allowing
+threads and ISRs to add and remove data items of any size. The queue is similar
+to a FIFO and serves as the underlying implementation for both :ref:`k_fifo
+<fifos_v2>` and :ref:`k_lifo <lifos_v2>`. For more information on usage see
+:ref:`k_fifo <fifos_v2>`.
+
 
 Configuration Options
 *********************