README update

README.md

@@ -6,11 +6,69 @@ methods with a focus on readable and concise syntax. Valitron is the
 simple and pragmatic validation library you've been loking for.
 
 [![Build
-Status](https://secure.travis-ci.org/vlucas/valitron.png)](http://travis-ci.org/vlucas/valitron)
+Status](https://travis-ci.org/vlucas/valitron.png?branch=master)](https://travis-ci.org/vlucas/valitron)
+
+## Why Valitron?
+
+Valitron was created out of frustration with other validation libraries
+that have dependencies on large components from other frameworks like
+Symfony's HttpFoundation, pulling in a ton of extra files that aren't
+really needed for basic validation. It also has purposefully simple
+syntax used to run all validations in one call instead of individually
+validating each value by instantiating new classes and validating values
+one at a time like some other validation libraries require.
+
+In short, Valitron is everything you've been looking for in a validation
+library but haven't been able to find until now: simple pragmatic
+syntax, lightweight code that makes sense, extensible for custom
+callbacks and validations, well tested, and without dependencies. Let's
+get started.
+
+## Installation
+
+Valitron uses [Composer](http://getcomposer.org) to install and update:
+
+```
+curl -s http://getcomposer.org/installer | php
+php composer.phar require vlucas/valitron
+```
+
+The examples below use PHP 5.4 syntax, but Valitron works on PHP 5.3+.
+
+## Usage
+
+Usage is simple and straightforward. Just supply an array of data you
+wish to validate, add some rules, and then call `validate()`. If there
+are any errors, you can call `errors()` to get them.
+
+```
+$v = new Valitron\Validator(array('name' => 'Chester Tester'));
+$v->rule('required', 'name');
+if($v->validate()) {
+    echo "Yay! We're all good!";
+} else {
+    // Errors
+    print_r($v->errors());
+}
+```
+
+Using this format, you can validate `$_POST` data directly and easily,
+and can even apply a rule like `required` to an array of fields:
+
+```
+$v = new Valitron\Validator($_POST);
+$v->rule('required', ['name', 'email']);
+$v->rule('email', 'email');
+if($v->validate()) {
+    echo "Yay! We're all good!";
+} else {
+    // Errors
+    print_r($v->errors());
+}
+```
 
 
-Contributing
-------------
+## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)