[PATCH v2 alsa-lib] README: add patch submission instructions

[Takashi Iwai]

On Sat, 15 Aug 2020 19:35:55 +0200,
Tanu Kaskinen wrote:
> 
> Signed-off-by: Tanu Kaskinen <tanuk at iki.fi>
> ---
> 
> v2:
>  - fixed Markdown syntax: changed ' to `
>  - added Signed-off-by

Applied, thanks.


Takashi