updates

src/main/java/de/iwomm/propify_api/entity/Property.java

@@ -219,4 +219,8 @@ public class Property {
     public void setFederalState(FederalState federalState) {
         this.federalState = federalState;
     }
+
+    public String getAddress() {
+        return this.street + " " + this.houseNumber + ", " + this.zipCode + " " + this.city;
+    }
 }