Update README.md

events/2020.09.Online/TDs/NHK/README.md

@@ -35,6 +35,14 @@ We provide
 ## API
 Please see [flows for Node-RED](https://github.com/w3c/wot-testing/blob/master/events/2020.09.Online/TDs/NHK/flows_nhk_plugfest202009.json)
 
+- ![readproperty to get Available TV Channels & TV Status](property.png)
+- ![invokeaction to tune TV channel & launch HybridcastAPP](action.png)
+- ![subscribeevent to receive Message from TV programs](event.png)
+
+
+## DEMO
+
+
 ## Hybrid TV Emulator AndroidTV App 
 - https://github.com/nhkrd/antwapp4hc
 - dns-sd is not supported in current version on github.