added script to obtain inventory details (#3)

tests/inventory.spec.js

@@ -0,0 +1,15 @@
+// @ts-check
+import {test, expect} from '@playwright/test'
+
+test("Get inventory details", async({request, baseURL}) =>  {
+
+    const response = await request.get(`${baseURL}store/inventory`);
+
+    // getting and saving the inventory details
+    const inventory = await response.json();
+
+    // assert that the api is working as expected
+    expect(response.ok()).toBeTruthy();
+    expect(response.status()).toBe(200);
+
+});