Move README to repo root for visibility, with simplified copy.

PiperOrigin-RevId: 273970488

Author: scottamain

README.md

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+# Coral examples using TensorFlow Lite API
+
+This repo contains example code for running inference on [Coral
+devices](https://coral.withgoogle.com/products) using the [TensorFlow Lite
+API](https://www.tensorflow.org/lite). Each example executes a different type of
+model, such as an image classification or object detection model.
+
+For instructions to set up and run the code, see the README inside each example.