feat: add create employee component (#527)

Fixes: #157

src/app/organization/organization.service.ts

@@ -47,6 +47,14 @@ export class OrganizationService {
     return this.http.get('/staff');
   }
 
+  /**
+   * @param {any} employee Employee to be created.
+   * @returns {Observable<any>}
+   */
+  createEmployee(employee: any): Observable<any> {
+    return this.http.post('/staff', employee);
+  }
+
   /**
    * @returns {Observable<any>} Currencies data
    */