adds manpage, desktop-file and debian install patch

docs/pokerth.1

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+.TH POKERTH 1 "December 03, 2007"
+.SH NAME
+pokerth \- Texas hold'em game
+.SH SYNOPSIS
+.B pokerth
+.SH DESCRIPTION
+pokerth is a free implementation of the famous "Texas hold'em" card game which
+is often played in casinos. If you don't understand the rules of this game then
+please have a look at http://en.wikipedia.org/wiki/Holdem where it is very well
+documented.
+.SH AUTHOR
+pokerth was written by Felix Hammer, Florian Thauer and Lothar May.
+.PP
+This manual page was written by Mario Iseli <admin@marioiseli.com>,
+for the Debian project (but may be used by others).