Add task-list creation.

src/app/app.module.ts

@@ -10,20 +10,32 @@ import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
 import {MatIconModule} from '@angular/material/icon';
 import {MatInputModule} from '@angular/material/input';
 import { DisplayTaskComponent } from './display-task/display-task.component';
+import { TaskListsComponent } from './task-lists/task-lists.component';
+import { AddTaskListComponent } from './task-lists/add-task-list/add-task-list.component';
+import {MatDialogModule} from '@angular/material/dialog';
+import {MatButtonModule} from '@angular/material/button';
+import {ReactiveFormsModule} from '@angular/forms';
+import {MatSnackBarModule} from '@angular/material/snack-bar';
 
 @NgModule({
   declarations: [
     AppComponent,
     MainPageComponent,
     AddTaskComponent,
-    DisplayTaskComponent
+    DisplayTaskComponent,
+    TaskListsComponent,
+    AddTaskListComponent
   ],
   imports: [
     BrowserModule,
     AppRoutingModule,
     BrowserAnimationsModule,
     MatIconModule,
-    MatInputModule
+    MatInputModule,
+    MatDialogModule,
+    MatButtonModule,
+    ReactiveFormsModule,
+    MatSnackBarModule
   ],
   providers: [
     CookieService,