add parking structure entity

src/entities/ParkingRepositoryEntities.ts

@@ -0,0 +1,9 @@
+import { ICoordinates, IEntityWithId, IEntityWithOptionalTimestamp } from "./SharedEntities";
+
+export interface IParkingStructure extends IEntityWithOptionalTimestamp, IEntityWithId {
+  address: string;
+  capacity: number;
+  spotsAvailable: number;
+  coordinates: ICoordinates;
+  name: string;
+}