🐛 pyUSIrest can't submit data with the current BioSample services

[bunop]

Describe the bug
BioSamples API has changed and this library can't deal with data submission. Root and others methods need to point to the proper API urls

To Reproduce
Try to instantiate a new Root class or create and submit data into BioSamples service

Expected behavior
Methods need to be updated in order to user the proper API url. Documents need to described how a submission can be made with the current URLs

Additional context
Try to understand the API submission system and define new python object to automate some stuff