Add basic interface and data service

frontend/src/app/interfaces/preset.interface.ts

@@ -0,0 +1,7 @@
+/** Represents the structure of a search preset. */
+export interface Preset {
+  preset_id: number;
+  parameter: string;
+  tag_label: string;
+  value: number[];
+}

frontend/src/app/interfaces/region.interface.ts

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+/** Represents the structure of a region. */
+export interface Region {
+  region_id: number;
+  name: string;
+  country: string;
+}

frontend/src/app/interfaces/result.interface.ts

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+/** Represents the structure of one search result. */
+export interface Result {
+  region_id: string;
+  region_name: string;
+  score: number;
+  scores: any[];
+}

frontend/src/app/services/data.service.spec.ts

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+import { TestBed } from '@angular/core/testing';
+
+import { DataService } from './data.service';
+
+describe('DataService', () => {
+  beforeEach(() => TestBed.configureTestingModule({}));
+
+  it('should be created', () => {
+    const service: DataService = TestBed.get(DataService);
+    expect(service).toBeTruthy();
+  });
+});

frontend/src/app/services/data.service.ts

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+import {Injectable} from '@angular/core';
+import {HttpClient} from '@angular/common/http';
+import {Preset} from '../interfaces/preset.interface';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class DataService {
+
+  private readonly API_URL = 'https://example.com/api/v1/';
+
+  constructor(private http: HttpClient) {
+  }
+
+  public getPresets(): Promise<Preset[]> {
+    return this.http.get<Preset[]>(this.API_URL + 'presets').toPromise();
+  }
+}