[Android] Tensorflow metadata 추가

https://beoks.tistory.com/68 -> 이것은 object detector를 위한 것

https://www.tensorflow.org/lite/convert/metadata_writer_tutorial#image_classifiers

https://colab.research.google.com/github/tensorflow/tensorflow/blob/master/tensorflow/lite/g3doc/convert/metadata_writer_tutorial.ipynb#scrollTo=Mq-riZs-TJGt -> 이미 있구만