feat: Create initial landing page (CAS-8) (!11)

Co-authored-by: Phan Huy Tran <p.tran@neusta.de>
Reviewed-on: https://git.simonis.lol/projects/casino/pulls/11
Reviewed-by: Constantin Simonis <constantin@simonis.lol>
Reviewed-by: lziemke <lea.z4@schule.bremen.de>

frontend/src/app/landing-page/landing-page.component.ts

@@ -0,0 +1,11 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-landing-page',
+  standalone: true,
+  imports: [],
+  templateUrl: './landing-page.component.html',
+})
+export class LandingPageComponent {
+
+}