It's very easy to release a package to the world, but for people to use our package, we should add a readme file so they can know how to use our package.

Create a file called README.md in the package folder we created earlier and add the following code snippet:

# ReactiveTimer

This package can run reactive functions in a given interval.
## Installation

    $ meteor add meteor-book:reactive-timer

## Usage

To use the timer, instantiate a new interval:

    var myTimer = new ReactiveTimer();

Then you can start an interval of 10 seconds using:

    myTimer.start(10);

To use the timer just call the following in any reactive function:

    myTimer.tick();

To stop the timer use:

    myTimer.stop();

As we can see, this file uses the markdown syntax. This way, it will look good on GitHub and http://atmospherejs.com, which is the website where you can browse all the available Meteor packages.

With this readme file, we will make it easy for other people to use...