Implemented the donation response

ref #66

src/models/entities/Donation.ts

@@ -3,6 +3,7 @@ import {
   IsNotEmpty
 } from "class-validator";
 import { Entity, ManyToOne, PrimaryGeneratedColumn, TableInheritance } from "typeorm";
+import { ResponseDonation } from '../responses/ResponseDonation';
 import { Donor } from './Donor';
 
 /**
@@ -31,12 +32,13 @@ export abstract class Donation {
    * The donation's amount in cents (or whatever your currency's smallest unit is.).
    * The exact implementation may differ for each type of donation.
    */
-  abstract amount: number;
+  public abstract get amount(): number;
+
 
   /**
    * Turns this entity into it's response class.
    */
-  public toResponse() {
-    return new Error("NotImplemented");
+  public toResponse(): ResponseDonation {
+    return new ResponseDonation(this);
   }
 }