added documentation

Makefile

@@ -1,9 +1,16 @@
 CC=gcc
 CFLAG= -O -g -o
+
+alldoc=python3 $(PWD)/.bin/alldoc
+
 objects=main.o\
 	playfield.o\
 	input_output.o
 
+headers=conf.h\
+	playfield.h\
+	input_output.h
+
 all:main
 
 %.o:%.c
@@ -15,3 +22,12 @@ main: clean $(objects)
 
 clean:
 	rm $(objects) || true
+
+doc.rst:$(headers)
+	$(alldoc) doc.rst.tmp $(headers)
+	printf "Documentation\n_____________\n\n" > doc.rst
+	cat doc.rst.tmp >> doc.rst
+	rm doc.rst.tmp
+
+doc.pdf:
+	rst2pdf doc.rst