add UCS service

Reviewed-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-authored-by: tischrei <tino.schreiber@t-systems.com>
Co-committed-by: tischrei <tino.schreiber@t-systems.com>

otc_metadata/data/documents/ucs-api-ref.yaml

@@ -0,0 +1,13 @@
+---
+hc_location: api/ucs
+html_location: docs/ucs/api-ref
+link: /ubiquitous-cloud-native-service/api-ref/
+rst_location: api-ref/source
+service_type: ucs
+title: API Reference
+type: api-ref
+cloud_environments:
+  - name: eu_de
+    visibility: internal
+    pdf_visibility: internal
+    pdf_enabled: true