README.md: add build status badge

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

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 # alsa-lib
 ## Advanced Linux Sound Architecture (ALSA) project
 
+![Build alsa-lib](https://github.com/alsa-project/alsa-lib/workflows/Build%20alsa-lib/badge.svg?branch=master)
+
 The alsa-lib is a library to interface with ALSA in the Linux kernel and
 virtual devices using a plugin system.