User Instance
GET /api/users/cern-mguth/?format=api
{
"username": "cern-mguth",
"first_name": "Manuel",
"last_name": "Guth",
"collections": [],
"visibility": 30
}GET /api/users/cern-mguth/?format=api
{
"username": "cern-mguth",
"first_name": "Manuel",
"last_name": "Guth",
"collections": [],
"visibility": 30
}