Add startup_scripts documentation

docs/site/vobox_startup_scripts.md

+# JAliEn Startup Scripts
+
+JAliEn Startup Scripts are used to control CE and MonaLisa services in VOboxes. The scripts will reside in `/cvmfs/alice.cern.ch/scripts/vobox`
+
+# Usage
+``` 
+Usage: jalien-vobox <Command> [<Service>]
+
+<Command> is one of: start status stop restart mlstatus
+
+<Service> is one of: ce monalisa (defaulting to both if not specified)
+```
+
+Running a command without specifying a service will run the command on both CE and MonaLisa services.
+
+## Configuration
+Both the services are able to start without any configurations. However, the following parameters can be overridden by defining them in `$HOME/.alien/config/version.properties` as key-value pairs.
+
+```
+MONALISA_HOME=<MonaLisa package location>
+MONALISA=<MonaLisa version>
+JALIEN=<JAliEn version>
+```
+
+> Note: as the MonaLisa package is not available in CVMFS yet, for now one can define MONALISA_HOME to specify the MonaLisa package location. If it is not locally available, please use `install` as the value for `<MonaLisa package location>`.
+
+> Note: the JAliEn MonaLisa package is not yet ready for widespread use, as it lacks a few features that are important for operations.
+
+If it is required to run any shell command before starting either of the services, they can be added in `$HOME/.alien/config/CE.env` or `$HOME/.alien/config/ml.env`. The former should typically contain a command to define the `X509_USER_PROXY` that should be used by the JAliEn CE to submit its jobs, for example as follows:
+
+```
+export X509_USER_PROXY=`ls -t /var/lib/vobox/alice/proxy_repository/*lcgadmin | sed q`
+```
+