Merge pull request #4111 from shaedrich/openapi

Add topic "OpenAPI"

Author: kenyonj

topics/openapi/index.md

@@ -0,0 +1,14 @@
+---
+topic: openapi
+aliases: open-api, swagger-spec, swagger-specification, openapi-spec, openapi-specification, open-api-specification, oas, openapi-description
+display_name: OpenAPI Specification
+short_description: The OpenAPI Specification is a specification for describing, producing, consuming, and visualizing web services.
+related: json-schema, raml, rest-api
+created_by: OpenAPI Initiative, Tony Tam, Darrel Miller, Mike Ralphson, Ron Ratovsky, Uri Sarid, Jason Harmon
+released: August 10, 2011
+url: https://www.openapis.org/
+wikipedia_url: https://en.wikipedia.org/wiki/OpenAPI_Specification
+github_url: https://github.com/OAI/OpenAPI-Specification
+---
+The **OpenAPI Specification** (**OAS**), previously known as the **Swagger Specification**, is a specification for a programming language-agnostic, machine-readable interface definition language for describing, producing, consuming, and visualizing web services. OpenAPI documents describe API services and are represented in YAML or JSON formats.
+