add README

Author: DrDaveD

packaging/debian/README.md

@@ -0,0 +1,16 @@
+In order to build this on OBS, follow these steps:
+
+1. Create a login for yourself at build.opensuse.org.
+2. Either use your home project or create a subproject, and select
+    Repositories matching those of [home:cvmfs:contrib](https://build.opensuse.org/repositories/home:cvmfs:contrib).  Edit each repository so the
+    Architectures and Additional package repositories match those of
+    home:cvmfs:contrib.
+3. On the Overview tab for the project, select "Branch existing package".
+    Use "home:cvmfs:contrib" as "Name of original project" and 
+    "cvmfs-config-osg" as "Name of package in original project" and select
+    "Create Branch".  It should then build, and you can reload the page
+    until it finishes.  You can also select the "_service" link, click
+    "show latest", and edit the source of the paths to be from
+    different sources if you want to and click "Save".
+4.  To find the built packages, click on Repositories back in the
+    project and select "Go to download repository".