Add a simple manpage.

The manpage is in pod format, and pod2man can be used to convert it.

Makefile

@@ -28,4 +28,7 @@ release:
 	@tar --owner=0 --group=0 --transform 's!^!gitstats/!' --transform 's!gitstats.tmp!gitstats!' -zcf gitstats-$(VERSION).tar.gz gitstats.tmp $(RESOURCES) doc/ Makefile
 	@$(RM) gitstats.tmp
 
+man:
+	pod2man --center "User Commands" -r $(shell git rev-parse --short HEAD) doc/gitstats.pod > doc/gitstats.1
+
 .PHONY: all help install release

doc/gitstats.pod

@@ -0,0 +1,38 @@
+=encoding utf8
+
+=head1 NAME
+
+gitstats - git history statistics generator
+
+=head1 SYNOPSIS
+
+B<gitstats> [options] <repository dir> <output dir>
+
+=head1 DESCRIPTION
+
+B<gitstats> is a statistics generator for L<git(1)> repositories. It examines the repository and produces some interesting statistics from the history of it.
+
+=head1 FAQ
+
+Q: How do I generate statistics of a non-master branch?
+
+A: Use C<-c commit_end=web> parameter.
+
+Q: I have files in my git repository that I would like to exclude from the statistics, how do I do that?
+
+A: At the moment the only way is to use L<git-filter-branch(1)> to create a temporary repository and generate the statistics from that.
+
+=head1 AUTHORS
+
+B<gitstats> was written by Heikki Hokkanen and others.
+
+See the git repository at http://repo.or.cz/w/gitstats.git for an up-to-date full list of contributors.
+
+=head1 WWW
+
+http://gitstats.sourceforge.net/
+
+=head1 SEE ALSO
+
+L<git(1)>
+