Update folder structure

src/app/service/productservice.ts

@@ -0,0 +1,38 @@
+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+import { Product } from '../api/product';
+
+@Injectable()
+export class ProductService {
+
+    constructor(private http: HttpClient) { }
+
+    getProductsSmall() {
+        return this.http.get<any>('assets/demo/data/products-small.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+
+    getProducts() {
+        return this.http.get<any>('assets/demo/data/products.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+
+    getProductsMixed() {
+        return this.http.get<any>('assets/demo/data/products-mixed.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+
+    getProductsWithOrdersSmall() {
+        return this.http.get<any>('assets/demo/data/products-orders-small.json')
+        .toPromise()
+        .then(res => res.data as Product[])
+        .then(data => data);
+    }
+}