Updated readme with information on how to generate server stub code given the update to OAS 3.0

Author: brandomr

README.md

@@ -5,8 +5,21 @@ Models as a Service (MaaS) API. This is specified using Swagger. See below for i
 To use this, run the following:
 
 ```
-docker pull swaggerapi/swagger-editor
+docker pull swaggerapi/swagger-editor:latest
 docker run -d -p 80:8080 swaggerapi/swagger-editor
 ```
 
-This will run Swagger Editor (in detached mode) on port 80 on your machine, so you can open it by navigating to http://localhost in your browser.
+This will run Swagger Editor (in detached mode) on port 80 on your machine, so you can open it by navigating to http://localhost in your browser.
+
+# Open API Code Generation
+
+Unfortunately, the current Swagger Editor does not support code gen for Open API 3.0 and Flask. To generate the server stub use:
+
+```
+wget http://central.maven.org/maven2/org/openapitools/openapi-generator-cli/3.3.4/openapi-generator-cli-3.3.4.jar -O openapi-generator-cli.jar
+
+java -jar openapi-generator-cli.jar generate \
+  -i model_service_api.yaml \
+  -l python-flask \
+  -o Rest-Server-UPDATE
+  ```