Add "how to build the doc ?"

README.md

@@ -1,8 +1,24 @@
 
 # the ooc language
 
-In progress, send feedback to amos@ofmlabs.org and mention 'ooc' in the subject.
+## status
+
+**In progress**, send feedback to amos@ofmlabs.org and mention 'ooc' in the subject.
 
 Thanks a lot =)
 
 Amos Wenger aka [@nddrylliog](http://twitter.com/nddrylliog)
+
+## how to build the doc ?
+
+Easy,
+
+    $ make
+
+will generate a single-page, HTML version of the documentation.
+
+Then,
+
+    $ make publish
+
+will switch to the `gh-pages` branch, commit the modifications and push the commits to `origin` (which may be your forked repository).