Update README.md

README.md

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 # Oddcast TTS Demo PHP library
+
+A library to interface with the online demo of Oddcast TTS engine.
+
+## Installation
+
+```
+composer require sergix44/oddcast-tts-php
+```
+
+## Example usage
+
+All the voices are listed on the official Oddcast demo page: http://ttsdemo.com/
+
+Every voice is ported in the corrisponding namespace e.g. the english voice `Julia`, is in the namespace `SergiX44/OddcastTTS/Voices/English/Julia_US.php`, and so on.
+
+The default voice is Julia (English US)
+```php
+use SergiX44\OddcastTTS\Oddcast;
+
+$tts = new Oddcast();
+$tts->setText('Hello my friend!')
+
+$url = $tts->getUrl(); // the url to the .mp3 file
+$stream = $tts->getAudio(); // the audio file
+$tts->save('path/to/file.mp3'); // save the mp3 on the filesystem
+```
+You can easily change voice, in the main constructor:
+```php
+
+use SergiX44\OddcastTTS\Oddcast;
+use \SergiX44\OddcastTTS\Voices\Italian\Raffaele;
+
+$tts = new Oddcast(Raffaele::class);
+$url = $tts->setText('Hello my friend!')->getUrl();
+```
+or via setter:
+```php
+
+use SergiX44\OddcastTTS\Oddcast;
+use \SergiX44\OddcastTTS\Voices\Italian\Raffaele;
+
+$tts = new Oddcast();
+$url = $tts->setText('Hello my friend!')
+  ->setVoice(Raffaele::class)
+  ->getUrl(); // you can chain all the calls together
+```