message: Fix interpreter import and add link to classify_picamera.py example
diff: @@ -87,12 +87,18 @@ from tensorflow.lite.python.interpreter import Interpreter
  So it instead reads:
  ```python
  -from tflite_runtime import Interpreter
  +from tflite_runtime.interpreter import Interpreter
  ```
  Now run `label_image.py` again. That's it! You're now executing TensorFlow Lite
  models.
  +## Learn more
  +
  +If you have a Raspberry Pi, try the
  +[classify_picamera.py example](https://github.com/tensorflow/examples/tree/master/lite/examples/image_classification/raspberry_pi)
  +to perform image classification with the Pi Camera and TensorFlow Lite.
  +
  For more details about the `Interpreter` API, read [Load and run a model
  in Python](inference.md#load-and-run-a-model-in-python).
  