Add PWA support and service worker

Author: Alian Rignack Quevedo

ngsw-config.json

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+{
+  "$schema": "./node_modules/@angular/service-worker/config/schema.json",
+  "index": "/index.html",
+  "assetGroups": [
+    {
+      "name": "app",
+      "installMode": "prefetch",
+      "resources": {
+        "files": [
+          "/favicon.ico",
+          "/index.html",
+          "/manifest.webmanifest",
+          "/*.css",
+          "/*.js"
+        ]
+      }
+    }, {
+      "name": "assets",
+      "installMode": "lazy",
+      "updateMode": "prefetch",
+      "resources": {
+        "files": [
+          "/assets/**",
+          "/*.(eot|svg|cur|jpg|png|webp|gif|otf|ttf|woff|woff2|ani)"
+        ]
+      }
+    }
+  ]
+}

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

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

src/app/services/api.service.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable } from 'rxjs';
+export interface Item {
+  name: string;
+  description: string;
+  url: string;
+  html: string;
+  markdown: string;
+}
+@Injectable({
+  providedIn: 'root'
+})
+export class ApiService {
+  private baseURL: string = "https://www.techiediaries.com/api/data.json";
+  constructor(private httpClient: HttpClient) { }
+  fetch(): Observable<Item[]> {
+    return <Observable<Item[]>>this.httpClient.get(this.baseURL);
+  }
+}