Update api.md

api.md

@@ -1,9 +1,8 @@
 # API
 Two API architectures are supported: WebSocket and REST.
 Both can be used with the same set of fields.  
-Everything is propagated to the mesh network automatically.
-
-Fields:  
+Everything is propagated to the mesh network automatically.  
+As everything can be controlled with topics, only two fields are required:  
 - topic
 - payload
 
@@ -35,4 +34,6 @@ Example:
 #### Endpoints
 Content-Type: application/x-www-form-urlencoded  
 POST /pixel/api  
+Request: Form post with topic and payload as fields  
+Response: 200 + JSON message that was used to notify the topics