Returns data about specified user. If user is not found, return 404. Response:
{
"username": "John Smith",
"user_id": "123",
"description": "Swell guy"
}
Updates a given user, takes as a POST body the new user information.
Request:
{
"username": "John Smith",
"user_id": "123",
"description": "meh"
}
Response:
status_code reflecting if the server properly handled the data