Create README.md

Author: sokil

README.md

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+# php-diff
+
+Highlight diffs provided by Sebastian Bergmann diff
+
+## Installation
+
+```
+composer.phar require sokil/php-diff
+```
+
+## Useage
+
+```php
+<?php
+
+$diffRenderer = new Renderer();
+$actualDiff = $diffRenderer->render(
+    implode(PHP_EOL, ['line1', 'line2', 'line3']),
+    implode(PHP_EOL, ['line1', 'line2changed', 'line3'])
+);
+
+```