Add HMRC IRR API as an example data service description

src/data/DataService/valid/hmrc-irr-api.yaml

@@ -0,0 +1,54 @@
+# Example DataService metadata record
+# The example corresponds to the Interest Restriction Return (IRR) API provided by DWP
+# Values taken from https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/interest-restriction-return/1.0 on 15 August 2023
+---
+identifier: interest-restriction-return
+type: dcat:DataService
+title: Interest Restriction Return (IRR) API
+accessRights: INTERNAL
+contactPoint:
+    contactName: Software Development Support Team (SDST)
+    email: [email protected]
+    address: https://developer.service.hmrc.gov.uk/developer/support
+description: |-
+  ## Overview
+
+  The API in its current state supports the following functions:
+
+  - Revoke an existing Reporting Company from submitting Interest Restriction Returns
+  - Appoint a new Reporting Company for submitting Interest Restriction Returns
+  - Submit an Interest Restriction Return (full)
+  - Submit an Interest Restriction Return (abbreviated)
+
+  This API uses User Restricted Endpoints. Please find further details on the [Authorisation](https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation) page.
+
+  For more information about how to develop your own client applications, including example clients for this API, see [Tutorials](https://developer.service.hmrc.gov.uk/api-documentation/docs/tutorials).
+
+  ## Errors
+
+  We use standard HTTP status codes to show whether an API request succeeded or not. They are usually in the range:
+
+  - 200 to 299 if it succeeded, including code 202 if it was accepted by an API that needs to wait for further action
+  - 400 to 499 if it failed because of a client error by your application
+  - 500 to 599 if it failed because of an error on our server
+
+  Errors specific to each API are shown in the Endpoints section, under Response. See our [reference guide](https://developer.service.hmrc.gov.uk/api-documentation/docs/reference-guide#errors) for more on errors.
+
+  ## Testing
+
+  You can use the [HMRC Developer Sandbox](https://developer.service.hmrc.gov.uk/api-documentation/docs/testing) to test the API. The Sandbox is an enhanced testing service that functions as a simulator of HMRC’s production environment.
+
+  ## Versioning
+
+  When an API changes in a way that is backwards-incompatible, we increase the version number of the API. See our [reference guide](/api-documentation/docs/reference-guide#versioning) for more on versioning.
+version: v1.0 (Beta)
+securityClassification: OFFICIAL
+creator: 
+  - hm-revenue-customs
+licence: https://www.apache.org/licenses/LICENSE-2.0
+modified: "2023-08-03"
+publisher: hm-revenue-customs
+endpointDescription: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/interest-restriction-return/1.0/oas/page
+endpointURL: https://api.service.hmrc.gov.uk/
+serviceStatus: BETA
+serviceType: REST