added AuthInterceptor for sending api key in the header on every request to api

src/app/services/auth.service.spec.ts

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { AuthService } from './auth.service';
+
+describe('AuthService', () => {
+  let service: AuthService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(AuthService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});

src/app/services/auth.service.ts

@@ -0,0 +1,12 @@
+import { Injectable } from '@angular/core';
+import { environment } from 'src/environments/environment';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AuthService {
+
+  getApiKey(): string{
+    return environment.apiKey;
+  }
+}