Migrated interfaces documentation to wiki.

README.md

@@ -4,9 +4,14 @@ Build: [![Circle CI](https://circleci.com/gh/eclipse/hawkbit.svg?style=svg)](htt
 
 [hawkBit](https://projects.eclipse.org/projects/iot.hawkbit) is an domain independent back end solution for rolling out software updates to constrained edge devices as well as more powerful controllers and gateways connected to IP based networking infrastructure.
 
+# Documentation
+
+see [hawkBit Wiki](https://github.com/eclipse/hawkbit/wiki)
+
 # Contact us
 
 * Want to chat with the team behind hawkBit? [![Join the chat at https://gitter.im/eclipse/hawkbit](https://badges.gitter.im/eclipse/hawkbit.svg)](https://gitter.im/eclipse/hawkbit?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+* Having issues with hawkBit? Open a [GitHub issue](https://github.com/eclipse/hawkbit/issues).
 * You can also check out our [Project Homepage](https://projects.eclipse.org/projects/iot.hawkbit) for further contact options.
 
 
@@ -14,7 +19,7 @@ Build: [![Circle CI](https://circleci.com/gh/eclipse/hawkbit.svg?style=svg)](htt
 
 We are not providing an off the shelf installation ready hawkBit update server. However, we recommend to check out the [Example Application](examples/hawkbit-example-app) for a runtime ready Spring Boot based update server that is empowered by hawkBit.
 
-#### Clone and build hawkBit 
+#### Clone and build hawkBit
 ```
 $ git clone https://github.com/eclipse/hawkbit.git
 $ mvn clean install
@@ -45,11 +50,6 @@ $ java –jar ./examples/hawkbit-mgmt-api-client/target/hawkbit-mgmt-api-client-
   * And of course tons of usability improvements and bug fixes.
 
 
-# Device Integration
-There are two device integration APIs provided by the hawkbit update server.
-* [Direct Device Integration API (HTTP)](DDIA.md)
-* [Device Management Federation API (AMQP)](DMFA.md)
-
 # Modules
 `hawkbit-core` : core elements.  
 `hawkbit-security-core` : core security elements.