Updated example

SDT/schema2.0/docs/Examples.md

 # Examples and Contributions
 
 ## HGI
+### Multi Socket Electrical-Extension-Block
+
+[mseeb.xml](../test/mseeb.xml)
+
+![Multi Socket Electrical-Extension-Block Structure](images/examples/hgi_mseeb.png)
 
 ## DECT ULE