update readme

Author: mmasiukevich

README.md

@@ -3,7 +3,10 @@
 [![Code Coverage](https://scrutinizer-ci.com/g/php-service-bus/scheduler/badges/coverage.png?b=v4.2)](https://scrutinizer-ci.com/g/php-service-bus/scheduler/?branch=v4.2)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/php-service-bus/scheduler/badges/quality-score.png?b=v4.2)](https://scrutinizer-ci.com/g/php-service-bus/scheduler/?branch=v4.2)
 
-This component is part of the [PHP Service Bus](https://github.com/php-service-bus/service-bus): common scheduler implementation.
+This component is part of the [PHP Service Bus](https://github.com/php-service-bus/service-bus): scheduler implementation.
+
+## Documentation
+For more details, read [Scheduler module](https://github.com/php-service-bus/documentation/blob/master/pages/modules/scheduler.md)
 
 ## Contributing
 Contributions are welcome! Please read [CONTRIBUTING](CONTRIBUTING.md) for details.