Updated the README

Added a reference about the Activiti SDK project

README.md

@@ -1,7 +1,9 @@
 # Activiti Docker Deployment v1.0.0
 
 Docker Compose project for deploying the Activiti Platform.
-The goal of this project is to help system administrators to manage an Activiti infrastructure deployed with Docker where they also need to configure parameters or install extensions.
+The goal of this project is to help system administrators to manage an Activiti infrastructure deployed with Docker where they also need to configure parameters or install extensions. 
+
+Developers can consider to use the [Activiti SDK](https://github.com/OpenPj/activiti-sdk) to create custom containers.
 
 The architecture template will help you deploying Activiti for you with the following tested components: