added scripts to the .gitignore

this project does not have shell scripts, not needed for build and run

Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>
added swagger plugin

Bug-Url: https://github.com/K0zka/kerub/issues/5
Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>
Swagger documentation configuration added to pom

Bug-Url: https://github.com/K0zka/kerub/issues/5
Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>