Added readme file for database creation and openxal-gui running. Also coppied database creation script from openxal-installation.
Added readme file for database creation and openxal-gui running. Also coppied database creation script from openxal-installation.

EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal