PI-1462 add api docs for tier to delius

projects/tier-to-delius/tech-docs/config/tech-docs.yml

@@ -39,3 +39,6 @@ github_branch: main
 # Slack
 owner_slack_workspace: mojdt
 default_owner_slack: '#probation-integration-tech'
+
+# OpenAPI
+api_path: https://tier-to-delius-dev.hmpps.service.justice.gov.uk/v3/api-docs.yaml

projects/tier-to-delius/tech-docs/source/api-reference.html.md.erb

@@ -0,0 +1,19 @@
+---
+title: API Reference
+source_url: 'https://github.com/ministryofjustice/hmpps-probation-integration-services/blob/main/projects/tier-to-delius/tech-docs/source/api-reference.html.md.erb'
+weight: 20
+---
+
+<header id="api" class="anchored-heading govuk-heading-xl" style="padding-top: 30px">
+    <a href="#api" class="anchored-heading__icon" aria-hidden="true" tabindex="-1"></a>
+    API Reference
+</header>
+<style>.technical-documentation > h1 { display: none !important }</style>
+
+The following documentation is also available in these formats:
+
+* [OpenAPI JSON](https://ministryofjustice.github.io/hmpps-probation-integration-services/tech-docs/projects/tier-to-delius/api-docs.json)
+* [OpenAPI YAML](https://ministryofjustice.github.io/hmpps-probation-integration-services/tech-docs/projects/tier-to-delius/api-docs.yaml)
+* [Swagger UI](https://tier-to-delius-dev.hmpps.service.justice.gov.uk/swagger-ui/index.html)
+
+api>