Update ARCHITECTURE.md

ARCHITECTURE.md

@@ -4,7 +4,7 @@ This document describes the the high-level architecture of the goSDN project. Al
 
 ## Bird's Eye View
 
-![simple architecture diagram](documentation/architecture.png)
+[<img src="documentation/architecture.png"  style="height:50%; width:50%" > ](documentation/architecture.png)
 
 On the highest level goSDn provides a gRPC northbound-interface and two types of southbound-interfaces: RESTCONF and gRPC-based. The northbound interface allows the interaction with a running goSDN daemon and may allow the stacking of multiple controllers in the future. The southbound interface (SBI) capabilities are split in `nucleus` models and plugins. The supported `nucleus` models are OpenConfig yang [openconfig-yang](https://github.com/openconfig/yang)  and TAPI. Third party models and more SBI-transports can be attached using the go plugin architecture.