Add explanation for strange script
exit 0
+# The reason for needing this file is to make `bosh export-release` happy.
+# BOSH doesn't know what job to export, so it tries to export a windows job
+# against a linux stemcell. This is a file that will cause a bash script to
+# immediately exit (such as when exporting a release) but be ignored when run
+# in powershell.
