Add a man page, increase helpfulness of the -h flag

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+.TH VOLSV 1 volsv\-0.1.2
+.SH NAME
+volsv \- volume set variable
+.SH SYNOPSIS
+.B volsv
+.RB [ \-i ]
+.RB [ \-d ]
+.RB [ \-t ]
+.RB [ \-m ]
+.RB [ \-v ]
+.RB [ \-g ]
+.SH DESCRIPTION
+.B volsv
+Volsv is a free software, POSIX shell compliant script ZachIR wrote in 2020, and
+has been modifying since, for simple volume control. Volsv controls volume for
+pulseaudio if it is running, and ALSA if it is not. More sound servers are
+intended to be added in future versions.
+.SH OPTIONS
+.TP
+.B \-i
+volsv increases the volume by 5%
+.TP
+.B \-d
+volsv decreases the volume by 5%
+.TP
+.B \-t
+volsv will toggle the volume mute
+.TP
+.BI \-m
+volsv will toggle the microphone mute
+.TP
+.BI \-v
+volsv will print the volume level
+.TP
+.BI \-g
+volsv will print the mute status
+.SH SEE ALSO
+.IR amixer (1),