add method to find real estate by id

app/helpers/db/realEstate.js

@@ -36,6 +36,11 @@ const bulkUpsertRealEstates = async realEstateData => {
   }
 };
 
-module.exports = {
-  bulkUpsertRealEstates
+const getRealEstateById = async id => {
+  return db.RealEstate.findByPk(id);
+};
+
+module.exports = {
+  bulkUpsertRealEstates,
+  getRealEstateById
 };