Update README.md

Author: alexcheng1982

README.md

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 # Bird Classifier
+
+A bird classifier powered by [Onnx runtime](https://onnxruntime.ai/) for Java.
+It
+uses [Bird Classifier EfficientNet-B2](https://huggingface.co/dennisjooo/Birds-Classifier-EfficientNetB2)
+model for bird classification.
+
+To use this bird classifier, download the latest release jar file `bird-classifier.jar
+` and run it with url of an image.
+
+```sh
+java -jar bird-classifier.jar https://images.unsplash.com/photo-1470619549108-b85c56fe5be8
+```
+
+The output is `american flamingo`.