add man page

README.md

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-Simple card game.
+# Fire
 
-# Usage
+A simple card game.
+
+## Usage
 
 `./fire`
 
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 `./stats`
 
 Play a number of games and look at the stats.
+
+`man -l fire.6`
+
+Read the manual.

fire.6

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+.TH FIRE 6 2022-04-07 "1.0" "Card game"
+
+.SH NAME
+fire - a fun card game
+
+.SH SYNOPSIS
+.B ./fire
+.br
+.B ./stats
+[ num_trials ]
+
+.SH DESCRIPTION
+.B fire
+simulates a game of cards between Alice and Bob. The game is played with a deck
+of cards with multiple suits, and ranks defined in the file
+.IR deck .
+Each player gets a hand consisting of all the cards of a given suit, and one suit is also distributed in the
+.IR prize
+pile. This pile is shuffled.
+
+Each round consists of a card placed faced up from the
+.IR prize
+pile, after which Alice plays a card of the same rank, and Bob plays a random
+card. The player with the highest card adds the rank of the
+.IR prize
+card to his or her score. When all cards have been played, the game is over, and
+the player with the highest score wins.
+
+.B stats
+runs the game a number of times and prints some statistics.
+
+.SH OPTIONS
+None.
+
+.SH BUGS
+None known.
+
+.SH "SEE ALSO"
+.BR shuf (1),
+.BR paste (1),
+.BR awk (1)