Fix employee details opened from qualification details not showing any skills (#34)

Co-authored-by: Phan Huy Tran <p.tran@neusta.de>
Reviewed-on: http://git.simonis.lol/angular/ems-frontend/pulls/34
Reviewed-by: Constantin Simonis <constantin@simonis.lol>

src/app/services/employee-api.service.ts

@@ -12,6 +12,10 @@ export default class EmployeeApiService {
 
   private static readonly BASE_URL = 'http://localhost:8089';
 
+  public getById(id: number): Observable<Employee> {
+    return this.http.get(`${EmployeeApiService.BASE_URL}/employees/${id}`)
+  }
+
   public deleteById(id: number): Observable<Employee> {
     return this.http.delete(`${EmployeeApiService.BASE_URL}/employees/${id}`)
   }