✏️ update readme

Author: Crhistian Ramirez

README.md

@@ -3,6 +3,7 @@
 The OrderCloud SDK for Javascript is a modern client library for building solutions targeting the [Ordercloud eCommerce API](https://developer.ordercloud.io/documentation). The SDK aims to greatly improve developer productivity and reduce errors.
 
 - [Features](#-features)
+- [Requirements](#requirements)
 - [Installation](#%EF%B8%8F-installation)
 - [Adding it to your project](#-adding-it-to-your-project)
   - [Using named imports](#using-named-imports)
@@ -11,11 +12,15 @@ The OrderCloud SDK for Javascript is a modern client library for building soluti
 - [Authentication](#-authentication)
 - [Filtering](#-filtering)
 - [Impersonation](#-impersonation)
+- [Configuration](#configuration)
+- [Handling Errors](#handling-errors-)
+- [Interceptors](#interceptors)
+- [Cancelling Requests](#cancelling-requests)
+- [Async/Await](#asyncawait)
 - [Typescript Support](#typescript-support)
   - [Understanding OrderCloud's models](#understanding-orderclouds-models)
   - [Strongly Typed xp](#strongly-typed-xp)
   - [Typescript utilities](#typescript-utilities)
-- [Handling Errors](#handling-errors-)
 - [License](#-license)
 - [Contributing](#-contributing)
 - [Getting Help](#-getting-help)
@@ -200,6 +205,7 @@ Simply set the options you need to override and the SDK will merge it with the d
 import { Configuration } from 'ordercloud-javascript-sdk';
 
 Configuration.Set({
+  baseApiUrl: 'https://sandboxapi.ordercloud.io',
   timeoutInMilliseconds: 20 * 1000
 })
 ```
@@ -225,7 +231,7 @@ Products.Get('my-product')
       // that falls outside of the range of 2xx, the error will be of type OrderCloudError
       // https://ordercloud-api.github.io/ordercloud-javascript-sdk/classes/orderclouderror
       console.log(error.message);
-      console.log(error.errors);
+      console.log(JSON.stringify(error.errors, null, 4));
     } else if (error.request) {
       // the request was made but no response received
       // `error.request` is an instance of XMLHttpRequest in the browser and an instance of http.ClientRequest in node.js
@@ -288,6 +294,42 @@ Products.List({search: 'Tennis balls'}, {cancelToken: signal.token})
 signal.cancel('This request was cancelled!')
 ```
 
+## Async/Await
+Async/Await is a special syntax to work with promises in a more comfortable fashion. Because the SDK is built with promises the syntax works right out of the box - simply add the `async` keyword to your outer function method.
+
+```javascript
+// with normal promises
+(() => {
+  Auth.Login('myusername', 'mypassword', 'myclientID', ['FullAccess'])
+    .then(authResponse => {
+      Tokens.SetAccessToken(authResponse.access_token)
+      Me.ListOrders().then(orderList => {
+        const firstOrder = orderList.Items[0]
+        console.log(firstOrder.Total)
+      })
+    })
+    .catch(err => {
+      console.log(err)
+    })
+})()
+```
+
+```javascript
+// with async/await
+(async () => {
+  try {
+    const authResponse = await Auth.Login('myusername', 'mypassword', 'myclientID', ['FullAccess'])
+    Tokens.SetAccessToken(authResponse.access_token)
+    const myOrders = await Me.ListOrders()
+    const firstOrder = myOrders.Items[0]
+  } catch (err) {
+    console.error(err)
+  }
+})()
+```
+
+> NOTE: async/await is part of ECMAScript 2017 and is not supported in Internet Explorer and older browsers without first transpiling to ES5 so use with caution.
+
 ## Typescript Support
 
 While Typescript is not required to use this project (we compile it down to ES5 javascript for you), it does mean there are some added benefits for our Typescript users. You will need a minimum of typescript version 3.5 for all features to work correctly.