doc: xrdp-xcon manual page

Add a manual page for xrdp-xcon, which is currently not installed, since
xrdp-xcon is not installed.

docs/man/Makefile.am

@@ -7,4 +7,7 @@ man_MANS = \
   xrdp-sesman.8 \
   xrdp-sesrun.8
 
-EXTRA_DIST = $(man_MANS)
+noinst_man_MANS = \
+  xrdp-xcon.8
+
+EXTRA_DIST = $(man_MANS) $(noinst_man_MANS)

docs/man/xrdp-xcon.8

@@ -0,0 +1,14 @@
+.TH "xrdp-xcon" "8" "0.7.0" "xrdp team"
+.SH NAME
+xrdp\-xcon \- X11 event loop debugging helper for XRDP
+
+.SH SYNOPSIS
+.B xrdp\-xcon
+
+.SH DESCRIPTION
+.PP
+\fBxrdp\-xcon\fP is a X application, which just opens a connection to the X server and polls for events.
+It's pretty useless.
+
+.SH SEE ALSO
+.BR xev (1).