doc: Add manpage for wmiv.

doc/wmiv.1

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+.TH wmiv "1" "June 2015"
+.SH NAME
+wmiv \- quick image viewer using wrlib
+.SH SYNOPSIS
+.B wmiv
+.RI [ \,image(s)\/ | \,directory\/ ]
+.SH OPTIONS
+.TP
+.B \-\-help
+print help text
+.TP
+.B \-\-version
+print version
+.SH KEYS
+.TP
+[+]
+zoom in
+.TP
+[\-]
+zoom out
+.TP
+[Esc]
+actual size
+.TP
+[D]
+launch diaporama mode
+.TP
+[L]
+rotate image on the left
+.TP
+[Q]
+quit
+.TP
+[R]
+rotate image on the right
+.TP
+[▸]
+next image
+.TP
+[◂]
+previous image
+.TP
+[▴]
+first image
+.TP
+[▾]
+last image
+.SH AUTHOR
+.B wmiv
+is a part of Window Maker.  It was written by David Maciejak.