Code + comment cleanup for the entities

ref #39

src/models/entities/Address.ts

@@ -10,7 +10,8 @@ import { Participant } from "./Participant";
 import { RunnerOrganisation } from "./RunnerOrganisation";
 
 /**
- * Defines a address (to be used for contact information).
+ * Defines the Address entity.
+ * Implemented this way to prevent any formatting differences.
 */
 @Entity()
 export class Address {
@@ -23,6 +24,7 @@ export class Address {
 
   /**
    * The address's description.
+   * Optional and mostly for UX.
    */
   @Column({ nullable: true })
   @IsString()
@@ -49,6 +51,8 @@ export class Address {
 
   /**
    * The address's postal code.
+   * This will get checked against the postal code syntax for the configured country.
+   * TODO: Implement the config option. 
    */
   @Column()
   @IsString()