766 hotfix: add yaml files, api-overview

Author: Nadia-JSch

docs/integration/api-overview.mdx

@@ -8,3 +8,16 @@ Application Programming Interface (APIs) define a contract of service for a set
 :::info
 Please visit our **[API documentation](https://api.device42.com/)** for detailed information on using Device42 APIs.
 :::
+
+## Device42 Swagger Files
+
+The current version of the API is hosted at [api.device42.com](https://api.device42.com/).
+
+You can find the previous versions of our Swagger (OpenAPI) YAML files below:
+
+- <a href="/assets/files/d42-swagger-v190510.yaml" download>v19.05.10</a>  
+- <a href="/assets/files/d42-swagger-v190430.yaml" download>v19.04.30</a>  
+- <a href="/assets/files/d42-swagger-v190310.yaml" download>v19.03.10</a>  
+- <a href="/assets/files/d42-swagger-v190200.yaml" download>v19.02.00</a>  
+- <a href="/assets/files/d42-swagger-v190100.yaml" download>v19.01.00</a>  
+- <a href="/assets/files/d42-swagger-v190000.yaml" download>v19.00.00</a>