async function create(req, res) {
    const newLocation = await gladys.location.create(req.params.user_selector, req.body);
    res.status(201).json(newLocation);
  }
@api {post} /api/v1/user/:user_selector/location create
@apiName create
@apiGroup Location
@apiParam {Number} latitude Latitude of the user
@apiParam {Number} longitude Longitude of the user
@apiParam {Number} altitude Altitude of the user
@apiParam {Number} accuracy Accuracy of the geolocation