Added some notes about efficent uploads.
Added some notes about efficent uploads.

Mouleshwar/Flask-S3-Uploader,doobeh/Flask-S3-Uploader,doobeh/Flask-S3-Uploader,Mouleshwar/Flask-S3-Uploader,themouli/Flask-S3-Uploader,themouli/Flask-S3-Uploader