Add ngrok in README

README.md

@@ -19,23 +19,28 @@ By the way, it's free because we are geeks, not businessmen. All we want is a
 
 ## Different ways to use YLT
 
-#### The web interface:
+#### The online tool:
 This is the best way to discover the tool: [http://yellowlab.tools](http://yellowlab.tools).  
 Please note the server is hosted in Baltimore, USA.
 
-#### The Command Line Client:
+#### The Command Line Client (CLI):
 Might be useful if you want to build an automation tool. The documentation is [here](https://github.com/gmetais/YellowLabTools/wiki/Command-Line-Interface).
 
 #### The NPM module:
 Can be used to build automation tools in NodeJS. The documentation is [here](https://github.com/gmetais/YellowLabTools/wiki/NodeJS-module).
 
-#### The Public API:
+#### The public API:
 Hosted on our http://yellowlab.tools server, it is a RESTful API that allows you to launch distant tests. The documentation is [here](https://github.com/gmetais/YellowLabTools/wiki/Public-API).
 
 #### The Grunt task:
 If you have a Continuous Integration platform, may I suggest you to use [grunt-yellowlabtools](https://github.com/gmetais/grunt-yellowlabtools)? You set it up once, then the task fails if the front-end quality conditions you defined are not met.
 
 
+## Use the online tool on your localhost
+
+You can use [ngrok](https://ngrok.com/), a tool that creates a secure tunnel, to test your localhost website with the online tool (or with the public API).
+
+
 ## Install your own private instance
 
 If your project is not accessible from outside, or if you want to fork and improve the tool, you can build your own instance. The documentation is [here](https://github.com/gmetais/YellowLabTools/wiki/Install-your-private-server).