add lsx.1

lsx.1

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+.TH LSX 1 dmenu\-VERSION
+.SH NAME
+lsx \- list executables
+.SH SYNOPSIS
+.B lsx
+.RB [ \-v ]
+.RI [ directory ...]
+.SH DESCRIPTION
+.B lsx
+lists the executables in each directory. If no directories are given the current
+working directory is used.
+.SH OPTIONS
+.TP
+.B \-v
+prints version information to stdout, then exits.