Ajout d'un exemple simple sur les observables.

src/app/observables-example/simple-observable-exemple/simple-observable-exemple.component.ts

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+import {Component} from '@angular/core';
+import {BehaviorSubject, Observable, Subject} from "rxjs";
+import {Car} from "../../core/model/car";
+
+@Component({
+  selector: 'app-simple-observable-exemple',
+  templateUrl: './simple-observable-exemple.component.html',
+  styleUrls: ['./simple-observable-exemple.component.scss']
+})
+export class SimpleObservableExempleComponent {
+  private carsSubject: BehaviorSubject<Car[]> = new BehaviorSubject<Car[]>([]);
+  private cars: Car[] = [];
+
+  get cars$(): Observable<Car[]> {
+    return this.carsSubject.asObservable();
+  }
+
+  addNewCar(): void {
+    const newCar: Car = {
+      id: `${Math.random() * 100}`,
+      brand: 'Toyota',
+      model: 'Yaris',
+      power: 12,
+      numberOfSeats: 5
+    }
+    this.cars.push(newCar);
+    this.emitCarsUpdateEvent();
+  }
+
+  removeCars(): void {
+    this.cars = [];
+    this.emitCarsUpdateEvent();
+  }
+
+  private emitCarsUpdateEvent(): void {
+    this.carsSubject.next(this.cars);
+  }
+}