created basic webApplication

src/app/not-found/not-found.component.html

@@ -0,0 +1 @@
+<p>not-found works!</p>

src/app/not-found/not-found.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { NotFoundComponent } from './not-found.component';
+
+describe('NotFoundComponent', () => {
+  let component: NotFoundComponent;
+  let fixture: ComponentFixture<NotFoundComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ NotFoundComponent ]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(NotFoundComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/not-found/not-found.component.ts

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+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-not-found',
+  template: `<h3>Страница не найдена.<h3>`
+})
+export class NotFoundComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+}