Provide specific examples of use with QIIME 2

[wasade]

...just in the readme for using data from .qza files, doing prediction tasks, and loading back into QIIME 2. Place into README.md. Does not need to be exhaustive, just light examples

[wasade]

$ conda activate qiime2-2023.9
$ qiime tools export --input-path your_file.qza --output-path foo.biom
$ conda activate amplicon-gpt
$ python amplicon-gpt.py predict --feature-table foo.biom ...
$ conda activate qiime2-2023.9
$ qiime tools import --input-path result.blah --type WhatEverThisIs --output-path result.blah.qza