Merge pull request #4 from LibreSign/feature/readme

add description code example

README.md

@@ -1,13 +1,26 @@
 # PHP wrapper for eSpeak NG
 
-### About eSpeak NG
+## About eSpeak NG
 
 eSpeak is a free and open-source, cross-platform, compact, software speech synthesizer.
 
-### About eSpeak NG in this project
+## About eSpeak NG in this project
 
 Thinking about accessibility for visually impaired users when they need to fill out the contact form. We decided to implement the eSpeak NG library, which has the functionality to speak captcha characters.
 
-### Library Documentation
+## Example
+
+```php
+header('Content-Type: audio/wav');
+header('Content-Disposition: inline;filename=captcha.wave');
+
+echo (new Espeak())
+        ->setOption('stdout')
+        ->setOption('s', '110')
+        ->setOption('v', (new Espeak())->getVoiceCode($_SERVER['HTTP_ACCEPT_LANGUAGE']))
+        ->execute('Hello World');
+```
+
+## Library Documentation
 
 https://github.com/espeak-ng/espeak-ng