code: def create_user(self, username, first_name=None, last_name=None):
  		
  		
  		url = api_url+'users/'
  		payload = {
  			'username':username
  		}
  		if first_name:
  			payload['first_name'] = first_name
  		if last_name:
  			payload['last_name'] = last_name
  		r = requests.post(url, data=json.dumps(payload), headers=self.headers)
  		print(request_status(r))
  		r.raise_for_status()
  		return User(r.json())
docs: Creates a new user object on database
  		Returns the User Object. Must be linked to a new trainer soon after