adding READMEs for audio classifier and text embedder web demos

examples/audio_classifier/js/README.md

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+# MediaPipe Text Classification task for web
+
+## Overview
+
+This web sample classifies audio into one of several classes. It uses the Yamnet model.
+
+The Yamnet model is an audio event classifier trained on the [AudioSet] dataset to predict audio events from the AudioSet ontology.(https://research.google.com/audioset/).
+
+## Prerequisites
+
+* A device that can access the web using Chrome, Firefox, or Safari
+* For iOS devices, iOS 16 or later
+
+## Running the demo
+
+The live demo and code are available in Codepen.
+
+[View the example on Codepen](https://codepen.io/mediapipe-preview/pen/wvxYYmy)

examples/text_embedder/js/README.md

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+# MediaPipe Text Classification task for web
+
+## Overview
+
+This web sample runs text embedding on two text inputs, and then determines how alike they are using cosine similarity. Scores range from -1 to 1. More similar texts have a higher score, less similar a lower score.
+
+## Prerequisites
+
+* A device that can access the web using Chrome, Firefox, or Safari
+* For iOS devices, iOS 16 or later
+
+## Running the demo
+
+The live demo and code are available in Codepen.
+
+[View the example on Codepen](https://codepen.io/mediapipe-preview/pen/XWBVZmE)