Merge branch 'doc/all_device_types_app' into 'main'

Update readme of all-device-types-app

See merge request app-frameworks/esp-matter!708

Author: chshu

examples/all_device_types_app/README.md

@@ -5,6 +5,9 @@ MATTER data model implements. It has been tested with multiple ecosystem Apple,
 
 See the [docs](https://docs.espressif.com/projects/esp-matter/en/latest/esp32/developing.html) for more information about building and flashing the firmware.
 
+**This example only implements mandatory clusters, attributes, commands, events, etc from the spec.**
+If you want to add any optional data model bits please add them in [create api](https://github.com/espressif/esp-matter/blob/main/examples/all_device_types_app/main/esp_matter_console_helpers.cpp#L146) under your desired device type case using [data model creation development guide](https://docs.espressif.com/projects/esp-matter/en/latest/esp32/developing.html#developing-your-product).
+
 ## 1. Additional Environment Setup
 
 No additional setup is required.