added interfaces

src/app/interfaces/loan.interfaces.ts

@@ -0,0 +1,10 @@
+import {BookInfo} from "./book.interfaces";
+import {UserInfo} from "./user.interfaces";
+
+export interface LoanInfo {
+    book: BookInfo;
+    user: UserInfo;
+    date: Date;
+    plannedReturningDate: Date;
+    effectiveReturningDate: Date;
+}

src/app/interfaces/user.interfaces.ts

@@ -0,0 +1,9 @@
+import {LoanInfo} from "./loan.interfaces";
+
+export interface UserInfo {
+    name: string;
+    firstName: string;
+    email: string;
+    birthDate: Date;
+    loan: LoanInfo[];
+}