man: add manpage for picom-inspect

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

man/meson.build

@@ -1,4 +1,4 @@
-mans = ['picom.1', 'picom-trans.1']
+mans = ['picom.1', 'picom-inspect.1', 'picom-trans.1']
 if get_option('with_docs')
 	a2x = find_program('a2x')
 	foreach m : mans

man/picom-inspect.1.asciidoc

@@ -0,0 +1,40 @@
+picom-inspect(1)
+================
+:doctype:     manpage
+:man source:  picom-inspect
+:man version: {picom-version}
+:man manual:  User Commands
+
+NAME
+----
+picom-inspect - easily test your picom rules
+
+SYNOPSIS
+--------
+*picom-inspect* ['OPTIONS']
+
+DESCRIPTION
+-----------
+*picom-inspect* matches your picom rules against a window of your choosing. It helps you test your rules, and shows you which ones of your rules (don't) work.
+
+OPTIONS
+-------
+*picom-inspect* accept the exact same set of options as *picom*. Naturally, most of those options will not be relevant.
+
+These are some of the options you might find useful (See *picom*(1) for descriptions of what they do):
+
+*--config*, *--log-level*, *--log-file*, all the options related to rules.
+
+NOTES
+-----
+*picom-inspect* is prototype right now. If you find any bug, for example, if rules are matched differently compared to *picom*, please submit bug reports to:
+
+<https://github.com/yshui/picom>
+
+RESOURCES
+---------
+Homepage: <https://github.com/yshui/picom>
+
+SEE ALSO
+--------
+*xcompmgr*(1), link:picom.html[*picom*(1)]

man/picom.1.asciidoc

@@ -556,4 +556,4 @@ Homepage: <https://github.com/yshui/picom>
 
 SEE ALSO
 --------
-*xcompmgr*(1), link:picom-trans.html[*picom-trans*(1)]
+*xcompmgr*(1), link:picom-inspect.html[*picom-inspect*(1)], link:picom-trans.html[*picom-trans*(1)]