add a diagram to introduce workflow of casting video player (#31707)

* add diagram * modify name * change the diagram. * Modify according to comments.
project-chip · Jan 31, 2024 · cdd128b · cdd128b
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diff --git a/examples/tv-casting-app/APIs.md b/examples/tv-casting-app/APIs.md
@@ -67,6 +67,9 @@ Next, you're ready to:
 1. [Read](#read-operations) endpoint attributes like playback state.
 1. [Subscribe](#subscriptions) to playback events.
 
+In order to illustrate these steps, refer to the figure below
+![workflow of casting video player](./diagram/workflow_of_casting_video_player.png)
+
 ## Build and Setup
 
 The Casting Client is expected to consume the Matter TV Casting library built

diff --git a/examples/tv-casting-app/diagram/workflow_of_casting_video_player.png b/examples/tv-casting-app/diagram/workflow_of_casting_video_player.png