Convert qualifications to table (#13)

Co-authored-by: Phan Huy Tran <p.tran@neusta.de>
Reviewed-on: #13

src/app/services/qualification.service.ts

@@ -0,0 +1,19 @@
+import {inject, Injectable} from "@angular/core";
+import {HttpClient} from "@angular/common/http";
+import {Observable} from "rxjs";
+import {Employee} from "../Employee";
+import {Qualification} from "../Qualification";
+
+
+@Injectable({
+  providedIn: 'root'
+})
+export default class QualificationService {
+  private http: HttpClient = inject(HttpClient);
+
+  private static readonly BASE_URL = 'http://localhost:8089';
+
+  public getAll(): Observable<Qualification[]> {
+    return this.http.get<Qualification[]>(`${QualificationService.BASE_URL}/qualifications`)
+  }
+}