Prepare initial websocket support

examples/run_asgi.py

@@ -0,0 +1,37 @@
+"""
+1. Create a simple Sanic app
+2. Run with an ASGI server:
+    $ uvicorn run_asgi:app
+    or
+    $ hypercorn run_asgi:app
+"""
+
+from sanic import Sanic
+from sanic.response import text
+
+
+app = Sanic(__name__)
+
+@app.route("/")
+def handler(request):
+    return text("Hello")
+
+@app.route("/foo")
+def handler_foo(request):
+    return text("bar")
+
+
+@app.websocket('/feed')
+async def feed(request, ws):
+    name = "<someone>"
+    while True:
+        data = f"Hello {name}"
+        await ws.send(data)
+        name = await ws.recv()
+
+        if not name:
+            break
+
+
+if __name__ == '__main__':
+    app.run(debug=True)