Added readme (#3)

Author: Nyholm

Readme.md

@@ -6,15 +6,33 @@
 [![Quality Score](https://img.shields.io/scrutinizer/g/php-translation/converter.svg?style=flat-square)](https://scrutinizer-ci.com/g/php-translation/converter)
 [![Total Downloads](https://img.shields.io/packagist/dt/php-translation/converter.svg?style=flat-square)](https://packagist.org/packages/php-translation/converter)
 
-This is an PHP-translation storage adapter that uses Symfony's translation writer
-and loader. 
+**Don't you hate all the different translations formats? Are you stuck with JMSTranslatorBundle? If so, this is the 
+tool for you!**
+
+This little tool can convert your translation files from one format to the excellent XLIFF 2.0. A perfect use case is 
+when you migrating from JMSTranslatorBundle to [PHP-translation](http://php-translation.readthedocs.io/).
 
 ### Install
 
 ```bash
 composer require php-translation/converter
 ```
 
+### Use
+
+Just run the command like below:
+
+```bash
+# Example
+./vendor/bin/translation-converter [input_dir] [output_dir] [format]
+
+# Convert from JMSTranslationBundle
+./vendor/bin/translation-converter app/Resources/translations app/Resources/translations-new jms
+
+# Convert from Yaml
+./vendor/bin/translation-converter app/Resources/translations app/Resources/translations-new yml
+```
+
 ### Documentation
 
 Read our documentation at [http://php-translation.readthedocs.io](http://php-translation.readthedocs.io/en/latest/).