added header and footer

Co-authored-by: Copilot <copilot@github.com>

src/app/site-footer/site-footer.ts

@@ -0,0 +1,10 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-site-footer',
+  templateUrl: './site-footer.html',
+  styleUrl: './site-footer.scss'
+})
+export class SiteFooter {
+  year = new Date().getFullYear();
+}