updated read me

Author: pajaydev

README.md

@@ -7,7 +7,27 @@ The intent is to simplify the request process by handling the tedious logic. It'
 [![npm version](https://badge.fury.io/js/ebay-node-api.svg)](https://badge.fury.io/js/ebay-node-api)
 [![Build Status](https://travis-ci.org/ajay2507/ebay-node-api.svg?branch=master)](https://travis-ci.org/ajay2507/ebay-node-api) 
 
-# Installing
+
+## Table of Contents
+
+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
+* [Installation](#installation)
+* [Usage](#usage)
+* [Examples](#examples)
+  * [Getting Access Token](#getaccesstoken)
+  * [Fetch Items By Keyword](#fetchitemsbykeyword)
+  * [Get All Categories](#getallcategories)
+  * [Get Items By Category](#getitemsbycategory)
+* [Test](#test)
+* [Issues](#issues)
+* [LICENSE](#license)
+
+
+
+## Installation
 
 ```shell
 npm install ebay-node-api
@@ -25,7 +45,7 @@ let ebay = new eBay({
 ```
 Creates a new `Ebay` instance.
 
-### How to get clientId:
+### Getting Client ID:
 
 Join eBay developers program. 
 Register your app here https://go.developer.ebay.com/quick-start-guide.
@@ -36,7 +56,7 @@ Register your app here https://go.developer.ebay.com/quick-start-guide.
 - `limit` - optional(`Number`) - fetch items functionality - Number that limits the number of data you need in response.
 - `details` - optional(`Boolean`) - Get User Details functionality - true, if you need details about the user.
 
-#### Example
+## Example
 
 ## GetAccessToken
 
@@ -72,7 +92,37 @@ ebay.findItemsByKeywords("iphone").then((data) => {
 });
 ```
 
-## How do I run the tests?
+## GetAllCategories
+```javascript
+const Ebay = require('../src/index');
+
+let ebay = new Ebay({
+    clientID: "-- Client App id ----",
+    details: "childCategories" //optional parameter
+});
+
+ebay.getAllCategories().then((data) => {
+    console.log(data); //extract data.CategoryArray
+}, (error) => {
+    console.log(error);
+})
+```
+## GetItemsByCategory
+```javascript
+const Ebay = require('../src/index');
+
+let ebay = new Ebay({
+    clientID: "-- Client APP ID ----",
+    limit: 6
+});
+ebay.findItemsByCategory(10181).then((data) => {
+    console.log(data);
+}, (error) => {
+    console.log(error);
+});
+```
+
+## Test
 All test files are present inside test folder. You can run using
 
 ```javascript
@@ -81,6 +131,8 @@ npm run test
 ## Issues:
 If you are facing any issues, you can create the issues [here](https://github.com/ajay2507/ebay-node-api/issues).
 
+## License:
+MIT.
 
 ## Examples:
 I have mentioned the examples here