Add MinIO admin API support.

[balamurugana]

No description provided.

[krisis]

@balamurugana it would be useful to have a README introducing this package and a couple of simple examples to demonstrate usage like we have for the minio package .

[torbendury]

Is there any documentation available on how to use this MinioAdmin object?

[balamurugana]

@torbendury If you know how to use mc admin command line, you can directly refer https://github.com/minio/minio-py/blob/master/minio/minioadmin.py

[torbendury]

@balamurugana That's what I did, but searching through function definitions doesn't feel right. At least a refer on the Python SDK docs to this file would be great, so that other who wonder about the admin API don't wonder how to access it.