Add Macropad asyncio article

content/articles/2023/adafruit_macropad_asyncio/files/async_array/code.py

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+from adafruit_macropad import MacroPad
+import usb_cdc, asyncio, random
+
+macropad = MacroPad()
+macropad.pixels.brightness = 0.3
+color = 0xad20b4
+
+async def get_key(taskslist):
+    while True:
+        key_event = macropad.keys.events.get()
+        if key_event:
+            if key_event.pressed:
+                print("key k:{} t:{}".format(key_event.key_number, len(taskslist)))
+                taskslist.append(asyncio.create_task(blink(key_event.key_number)))
+        await asyncio.sleep(0)
+
+async def blink(led):
+    timer = random.random() * 3
+    for _ in range(5):
+        macropad.pixels[led] = color
+        await asyncio.sleep(timer)
+        macropad.pixels[led] = 0x0
+        await asyncio.sleep(timer)
+
+async def manage_tasks(taskslist):
+    tasks = 0
+    print("Run task manager  t:{}".format(len(taskslist)))
+    while True:
+        for task_number in range(0, len(taskslist)):
+            if taskslist[task_number].done():
+                print("Remove task t:{}/{}".format(task_number + 1,len(taskslist)))
+                taskslist.pop(task_number)
+                break
+        await asyncio.sleep(0)
+
+async def main():
+    tasks = []
+    tasks.append(asyncio.create_task(get_key(tasks)))
+    tasks.append(asyncio.create_task(manage_tasks(tasks)))
+    await asyncio.gather(*tasks)
+
+asyncio.run(main())