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
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Write Service definition for guidebook based on https://gitlab.developers.cam.ac.uk/uis/devops/docs/guidebook/-/blob/master/docs/services/service-template.md