Add async decorator example

Author: d-ryzhykau

examples/async_decorator.py

@@ -0,0 +1,18 @@
+import asyncio
+
+from memory_profiler import profile
+
+
+@profile
+@asyncio.coroutine
+def foo():
+    a = [1] * (10 ** 6)
+    b = [2] * (2 * 10 ** 7)
+    yield from asyncio.sleep(1)
+    del b
+    return a
+
+
+if __name__ == "__main__":
+    loop = asyncio.get_event_loop()
+    loop.run_until_complete(foo())