Adding a readme to the audio-video-deprecated example

Author: nfriedly

examples/static/audio-video-deprecated/README.md

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+# Audio/Video element transcription example (UNSUPPORTED)
+
+This example shows transcription using a HTML5 `<audio>` element as the audio source. 
+It should work identically with a `<video>` element.
+
+## Deprecated/Unsupported
+
+The `recognizeElement()` was deprecated and removed from the SDK due to issues with quality and consistency. 
+The code was moved here to allow individuals to continue using it without being pinned to an older version of the SDK.
+
+You are welcome to use this code, but it is not officially supported, and you are on your own if you run into issues.
+
+## Setup
+
+To try out the example, run `npm start` in the [../../examples](../../examples) directory, 
+then visit http://localhost:3000/audio-video-deprecated/
+
+The example uses the Node.js server to host the content, bundle the JavaScript files, and generate access tokens.
+