Add Navbar Component

src/app/components/navbar/navbar.component.html

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+<mat-toolbar id="navbar">
+  <span>Flotte</span>
+  <button mat-icon-button [matMenuTriggerFor]="menu" id="menu-trigger-button">
+    <mat-icon>more_vert</mat-icon>
+  </button>
+  <mat-menu #menu="matMenu">
+    <div mat-menu-item disableRipple="true" (click) = "$event.stopPropagation()">
+      <mat-slide-toggle (change)="changeTheme($event)" [checked]="darkThemeIsActive">Dark Mode</mat-slide-toggle>
+    </div>
+  </mat-menu>
+</mat-toolbar>

src/app/components/navbar/navbar.component.scss

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+#navbar {
+    #menu-trigger-button {
+        margin-left: auto
+    }
+}

src/app/components/navbar/navbar.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { NavbarComponent } from './navbar.component';
+
+describe('NavbarComponent', () => {
+  let component: NavbarComponent;
+  let fixture: ComponentFixture<NavbarComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ NavbarComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(NavbarComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/components/navbar/navbar.component.ts

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+import { Component, OnInit } from '@angular/core';
+import { ColorThemeService } from '../../services/colorTheme.service';
+
+@Component({
+  selector: 'app-navbar',
+  templateUrl: './navbar.component.html',
+  styleUrls: ['./navbar.component.scss'],
+})
+export class NavbarComponent implements OnInit {
+  darkThemeIsActive: boolean = false;
+  constructor(private themeService: ColorThemeService) {
+    this.darkThemeIsActive = this.themeService.currentActive() === "dark-theme";
+  }
+  
+
+  ngOnInit(): void {}
+
+  changeTheme(event) {
+    this.themeService.update((event.checked) ? "dark-theme" : "light-theme");
+  }
+}