Added readme to setup.py data folder

In order to ensure the data folder is created in the library
structure on install, a readme file was added to the
package-data variable, so that the folder can be built even
if there is no config file present.
Fixed path search for data folder

As the directory for the config file is now installed with the
modules, it was necessary to use the appropriate path relative
identification to extract and save to the right location.
This was acheived with the pkg_resources module. Previous
attempts are still in the script comments, in case future bugs
arise that can be solved through them.