Mention yum-builddeps for installing build dependencies, set a link to the...

Mention yum-builddeps for installing build dependencies, set a link to the puppet/modules directory in the documentation

Readme.md

@@ -6,13 +6,15 @@ If you need assistence you can (almost) always reach us on [IRC](https://irc.eox
 
 ## (Currently) Supported Projects
 
-Currently we _automagically_ install the build dependencies for the following projects:
+Currently we _automagically_ install the build dependencies for the following projects. For an up-to-date list (in case somebody forgot to add his project to thos list, see [puppet/modules](puppet/modules/)).
 
 * eox-release (which doesn't have any, so it's easy)
 * mapserver
 * rasdaman
 * eoxserver
 
+If your software mentions all build dependencies in its SPEC file, you don't need to create a new puppet module.
+
 ## To start building
 
 Clone this project!
@@ -41,6 +43,7 @@ Change to the _rpmbuild_ folder and start building
 
 ```bash
 cd rpmbuild
+yum-builddep SPECS/project.spec
 rpmbuild -ba SPECS/project.spec
 ```