update README, add example to write category into JSON file

.gitignore

@@ -62,3 +62,6 @@ typings/
 
 #IDE
 .idea
+
+#Temp Directory
+temp/*

README.md

@@ -58,10 +58,13 @@ eBay.setApiKey('YOUR_KEY', 'YOUR_SECRET');
 - Contributors can send their Pull Request to `development` branch.
 - Kindly validate test cases & linting before opening new PR.
 
+## Do you need an expert?
+Are you finding a developer for your word class product? If yes, please contact here. [Submit your project request here.](https://goo.gl/forms/UofdG5GY5iHMoUWg2)
 ```
 Originally by [Bhushankumar Lilapara](https://github.com/bhushankumarl) ([email protected]).
 ```
 
+## Examples
 ### Application
 #### Oauth Token
 ```

examples/javaScript/commerce/taxonomy/getCategorySubtree.js

@@ -17,13 +17,13 @@ var categoryRequest = async function () {
         return;
     }
 
-    var categoryTreeId = 203;
+    var categoryTreeId = '0';
     var data = {
-        category_id: '179623'
+        category_id: '34'
     };
     try {
         var response = await eBay.taxonomy.getCategorySubtree(categoryTreeId, data);
-        console.log('response', response);
+        console.log('response', JSON.stringify(response));
     } catch (error) {
         console.log('error ', error);
         return;

examples/javaScript/commerce/taxonomy/getCategoryTreeToFile.js

@@ -0,0 +1,32 @@
+'use strict';
+
+var clientId = process.env.EBAY_CLIENT_ID || 'YOUR_KEY';
+var clientSecret = process.env.EBAY_CLIENT_SECRET || 'YOUR_SECRET';
+
+var eBay = require('../../../../lib/eBay-node-client')(clientId, clientSecret);
+var fse = require('fs-extra');
+
+var categoryRequest = async function () {
+    try {
+        var token = await eBay.application.getOAuthToken({
+            grant_type: 'client_credentials',
+            scope: 'https://api.ebay.com/oauth/api_scope'
+        });
+        eBay.setToken(token.access_token);
+    } catch (error) {
+        console.log('error ', error);
+        return;
+    }
+
+    var categoryTreeId = '0';
+    try {
+        var response = await eBay.taxonomy.getCategoryTree(categoryTreeId);
+        console.log('response', JSON.stringify(response));
+        fse.writeFileSync('temp/response.json', JSON.stringify(response));
+    } catch (error) {
+        console.log('error ', error);
+        return;
+    }
+};
+
+categoryRequest();