Bring back older background task example under a new name

examples/background_task_asyncio.py

@@ -0,0 +1,28 @@
+import discord
+import asyncio
+
+class MyClient(discord.Client):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # create the background task and run it in the background
+        self.bg_task = self.loop.create_task(self.my_background_task())
+
+    async def on_ready(self):
+        print('Logged in as')
+        print(self.user.name)
+        print(self.user.id)
+        print('------')
+
+    async def my_background_task(self):
+        await self.wait_until_ready()
+        counter = 0
+        channel = self.get_channel(1234567) # channel ID goes here
+        while not self.is_closed():
+            counter += 1
+            await channel.send(counter)
+            await asyncio.sleep(60) # task runs every 60 seconds
+
+
+client = MyClient()
+client.run('token')