Add OpenAPI extension

modules/openapi/index.md

@@ -0,0 +1,33 @@
+---
+title: OpenAPI
+categories:
+  - cloud
+docs:
+  - id: java
+    url: https://github.com/gcatanese/openapi-testcontainers
+    maintainer: community
+    example: |
+      ```java
+          @ClassRule
+          public static GenericContainer container = new GenericContainer(
+            new ImageFromDockerfile("my-test-cont", false)
+                    .withFileFromFile("openapi.yaml", new File(OPENAPI_FILE))
+                    .withFileFromFile("Dockerfile", new File("Dockerfile"))
+            )
+            .withExposedPorts(8080);      
+      ```
+    installation: |
+      ```xml
+      <dependency>
+        <groupId>org.testcontainers</groupId>
+        <artifactId>testcontainers</artifactId>
+        <version>1.17.3</version>
+        <scope>test</scope>
+      </dependency>
+      ```
+description: |
+  The OpenAPI Testcontainers extension allows developers to create on-the-fly a lightweight Test Container from an
+  [OpenAPI](https://spec.openapis.org/) specification file. The API container is loaded when the Junit tests start and can be used to mock the different endpoints and payloads.
+
+  Read more on [openapi-testcontainers](https://github.com/gcatanese/openapi-testcontainers) and checkout the [demo](https://github.com/gcatanese/openapi-testcontainers-demo).
+---