TAS - Add service definition to guidebook
Write Service definition for guidebook based on https://gitlab.developers.cam.ac.uk/uis/devops/docs/guidebook/-/blob/master/docs/services/service-template.md
Edited by Adam Deacon
Write Service definition for guidebook based on https://gitlab.developers.cam.ac.uk/uis/devops/docs/guidebook/-/blob/master/docs/services/service-template.md