Added service file and installer script that 'installed' the tree version

Our enpironment service needs an easy way to be 'installed' from the tree
into place. The scripts/install/service/install.sh script will do that.
If that is too many levels of abstraction, we can thin it out. The project
and service should stay as small and simple as possible.

new file:   scripts/install/service/install.sh
new file:   service/enpironment

git-size-diff:
   (filed a bug because apparently new added files aren't picked up by git size-diff)