Update concurrency.py

Author: KRRT7

src/async_examples/concurrency.py

@@ -40,4 +40,9 @@ async def sorter(arr):
                 arr[j] = arr[j + 1]
                 arr[j + 1] = temp
     print(f"result: {arr}")
-    return arr
+    return arr
+
+
+async def task():
+    time.sleep(1)
+    return "done"