WIP: API docs

README.md

@@ -3,6 +3,18 @@ tristanable
 
 Tag-based asynchronous messaging framework
 
+## Usage
+
+The entry point is via the `Manager` type, so first create an instance as follows (passing the endpoint `Socket` in as `socket` in this example)
+
+```d
+Manager manager = new Manager(socket);
+```
+
+Now the event loop would have started.
+
+**TODO**
+
 ## Format
 
 ```