Add a quick doc on how to build the doc

README.md

@@ -2,3 +2,15 @@
 
 Source code to gluster documentation: http://gluster.readthedocs.io
 
+# Building the docs
+
+If you are on EPEL 7 or Fedora, the first thing you will need is to install
+mkdocs, with the following command (replace yum by dnf on Fedora):
+
+    # yum install mkdocs
+
+Then you need to run mkdocs from the root of that repository:
+
+    $ mkdocs build
+
+The result will be in the site/ subdirectory, in HTML