Fix tasks persistence and display.

src/app/app.module.ts

@@ -7,19 +7,23 @@ import { AppComponent } from './app.component';
 import { MainPageComponent } from './main-page/main-page.component';
 import { AddTaskComponent } from './add-task/add-task.component';
 import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
-import {MatIconModule} from '@angular/material/icon'; 
+import {MatIconModule} from '@angular/material/icon';
+import {MatInputModule} from '@angular/material/input';
+import { DisplayTaskComponent } from './display-task/display-task.component';
 
 @NgModule({
   declarations: [
     AppComponent,
     MainPageComponent,
-    AddTaskComponent
+    AddTaskComponent,
+    DisplayTaskComponent
   ],
   imports: [
     BrowserModule,
     AppRoutingModule,
     BrowserAnimationsModule,
-    MatIconModule
+    MatIconModule,
+    MatInputModule
   ],
   providers: [
     CookieService,