Added missing pagenotfound files

src/app/pagenotfound/pagenotfound.component.html

+<div class="page-not-found">
+  <h1>404</h1>
+  <h2><small>{{"404.page-not-found" | translate}}</small></h2>
+  <br>
+  <p>{{"404.help" | translate}}</p>
+  <br>
+  <p class="text-center">
+    <a routerLink="/home" class="btn btn-primary">{{"404.link.home-page" | translate}}</a>
+  </p>
+</div>
\ No newline at end of file

src/app/pagenotfound/pagenotfound.component.scss

+@import '../../styles/variables.scss';

src/app/pagenotfound/pagenotfound.component.ts

+import { Component } from '@angular/core';
+
+
+@Component({
+  selector: 'ds-pagenotfound',
+  styleUrls: ['./pagenotfound.component.css'],
+  templateUrl: './pagenotfound.component.html'
+})
+export class PageNotFoundComponent {
+
+  data: any = {};
+
+  constructor() {
+    this.universalInit();
+  }
+
+  universalInit() {
+
+  }
+
+}