User class prototype defined
Update user_data_structure.txt
Merge branch 'master' of https://github.com/corso-python-prato/share-system-team2
Merge branch 'master' of https://github.com/corso-python-prato/share-system-team2
Merge branch 'master' of https://github.com/corso-python-prato/share-system-team2
Indent userdata.json
Merge branch 'master' of https://github.com/corso-python-prato/share-system-team2