Update README.md

Author: sokil

README.md

@@ -2,6 +2,8 @@
 
 Highlight diffs provided by Sebastian Bergmann diff
 
+[![Build Status](https://travis-ci.org/sokil/php-diff.svg?branch=master)](https://travis-ci.org/sokil/php-diff)
+
 ## Installation
 
 ```
@@ -13,10 +15,78 @@ composer.phar require sokil/php-diff
 ```php
 <?php
 
+use Sokil\Diff\Change;
+use Sokil\Diff\Renderer;
+
 $diffRenderer = new Renderer();
-$actualDiff = $diffRenderer->render(
+$actualDiff = $diffRenderer->render(new Change(
     implode(PHP_EOL, ['line1', 'line2', 'line3']),
     implode(PHP_EOL, ['line1', 'line2changed', 'line3'])
-);
+));
+
+```
+
+## Format of diff output
+
+Format of diff tags may be configured. By default renders only two tags: `<ins>` and `<del>`. To 
+highlight output, use predefined format:
+
+```php
+<?php
+$renderer = new Renderer([
+    'format' => Renderer::FORMAT_COLOUR
+]);
+```
+
+This will produce following HTML:
+
+```html
+line1
+<del style="background: #ffe7e7;">line2</del>
+<ins style="background: #ddfade;">line2changed</ins>
+line3
+```
+
+To fully customize style, use next syntax (this format has alias `Renderer::FORMAT_COLOUR`):
+
+```php
+<?php
+$renderer = new Renderer([
+    'format' => [
+        'insert' => [
+            'tag' => 'ins',
+            'attributes' => 'style="background: #ddfade;"',
+        ],
+        'delete' => [
+            'tag' => 'del',
+            'attributes' => 'style="background: #ffe7e7;"',
+        ]
+    ]
+]);
+
+// this is same to
+$renderer = new Renderer([
+    'format' => Renderer::FORMAT_COLOUR
+]);
+```
+
+Default format `Renderer::FORMAT_DEFAULT` has following notation:
+
+```php
+<?php
+$renderer = new Renderer([
+    'insert' => [
+        'tag' => 'ins',
+    ],
+    'delete' => [
+        'tag' => 'del',
+    ]
+]);
 
+// this is same to
+$renderer = new Renderer([
+    'format' => Renderer::FORMAT_DEFAULT
+]);
 ```
+
+You can omit any