boards: stm32n6570_dk: Add link to Zephyr computer vision application

Put a link to the newly available Zephyr based People detection
application.

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

boards/st/stm32n6570_dk/doc/index.rst

@@ -27,7 +27,7 @@ programmer for the STM32 MCU, with a USB Virtual COM port bridge and the compreh
 Hardware
 ********
 
-- STM32N657X0H3Q Arm® Cortex®‑M55‑based microcontroller featuring ST Neural-ART Accelerator,
+- STM32N657X0H3Q Arm® Cortex®‑M55‑based microcontroller featuring ST Neural-ART Accelerator™,
   H264 encoder, NeoChrom 2.5D GPU, and 4.2 Mbytes of contiguous SRAM, in a VFBGA264 package
 - 5" LCD module with capacitive touch panel
 - USB Type-C® with USB 2.0 HS interface, dual‑role‑power (DRP)
@@ -73,6 +73,13 @@ STM32N6570-DK features a CSI camera module with a high-resolution 5‑Mpx CMOS R
 This camera outputs images in RAW Bayer format which require signal processing to be displayed with
 real life colors. This Image Signal Processing could be done with a dedicated `STM32 ISP module`_.
 
+NPU
+===
+
+STM32N6570-DK also embeds the ST Neural-ART Accelerator |trade| as NPU engineered for power-efficient edge
+AI applications, such as the `Zephyr computer vision application`_ which is available as a separate
+Zephyr application.
+
 USB
 ===
 
@@ -389,3 +396,6 @@ To do so, it is advised to use Twister's hardware map feature with the following
 
 .. _STM32 ISP module:
    https://github.com/stm32-hotspot/zephyr-stm32-mw-isp
+
+.. _Zephyr computer vision application:
+   https://github.com/stm32-hotspot/zephyr-stm32n6-ai-people-detection