README.md -> README.rst to follow saltstack docs

README.md → README.rst

@@ -4,6 +4,11 @@ apt-cacher-formula
 Install the apt-cacher. This allows you to install either the server or the
 client version.
 
+.. note::
+    See the full `Salt Formulas installation and usage instructions
+    <http://docs.saltstack.com/topics/conventions/formulas.html>`_.
+    
+
 Requirements
 ------------
 apache-formula