doc: Add Makefile for documentation

diff --git a/doc/Makefile b/doc/Makefile
new file mode 100644 (file)
index 0000000..13d6b26
--- /dev/null
+++ b/doc/Makefile
@@ -0,0 +1,4 @@
+GRAPHS = parser.png tokenizer.png
+
+%.png: %.dot
+       dot -Tpng -o$@ $<