Provide an example of using an in-process queue

[DarkArc]

[aaugustin]

Thank you for the PR, it's a good starting point. The code requires a few changes (e.g. async for vs. for). I'll adjust it to make it work then merge.

[liuyangc3]

iter websocket should be async

async def consumer_handler(websocket):
-    for message in websocket:
+    async for message in websocket:
        await queue.put(message)

[DarkArc]

Yeah, I thought @aaugustin was going to fix that little bit based on his comment. Anyways, fixed and squashed.

[aaugustin]

I intended to do it but didn't work on this projects for a few weeks :-|