async function create(area) {
  const areaCreated = await db.Area.create(area);
  this.areas.push(areaCreated);
  return areaCreated;
}
@description Create an area.
@param {object} area - An area object.
@returns {Promise} Resolve with created area.
@example
gladys.area.create({
   name: 'Work',
   latitude: 10,
   longitude: 10,
   radius: 200
   color: '#00000'
});