[docs] [issue30145] Create a How to or Tutorial documentation for asyncio

[Yury Selivanov]

Yury Selivanov added the comment:

> The problem is that Python stdlib is quite limited: no HTTP, no SQL client,
etc. An external tutorial can use 3rd party modules like aiohttp.

Even without aiohttp we can show how to use asyncio correctly. I agree with Mariatta that we should have a tutorial etc. Working on it.

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