arecord: add page (#4307)

pages/linux/arecord.md

@@ -0,0 +1,16 @@
+# arecord
+
+> Sound recorder for ALSA soundcard driver.
+> More information: <https://linux.die.net/man/1/arecord>.
+
+- Record a snippet in "CD" quality (finish with Ctrl-C when done):
+
+`arecord -vv --format=cd {{path/to/file.wav}}`
+
+- Record a snippet in "CD" quality, with a fixed duration of 10 seconds:
+
+`arecord -vv --format=cd --duration={{10}} {{path/to/file.wav}}`
+
+- Record a snippet and save it as mp3 (finish with Ctrl-C when done):
+
+`arecord -vv --format=cd --file-type raw | lame -r - {{path/to/file.mp3}}`