I'm trying to enable Cors for the Stack RestAPI and all its methods whenever I deploy. I've managed to do it manually by creating an Empty Model, and then setting it up as the response alongst with statusCode 200.

Problem is, I don't want it to get reset and have to manually change it. The closest I've found so far was Someone else that suggested something like this: 

```
  OptionsMethod:
    Type: AWS::ApiGateway::Method
    Properties:
      AuthorizationType: NONE
      RestApiId: !Ref MyApi
      ResourceId: !GetAtt MyApi.RootResourceId
      ...

```

I've tried modifying it to every flavor I could think of by replacing `MyApi` with `ServerlessRestApi` which seems to be the implicit Rest Api. I can't figure out how to make it work except by creating another API than the implicit one. 

In short, I want the cors to be enabled by default when I deploy my/a new lambda function.