Create APIGatewayClient.yaml

[miryamvillegas]

First version

Proposed Changes

• First version tested at interface branch

Pull request checklist

Please check if your PR fulfills the following requirements:

• [X] Tests
• [X] Build locally
• [ ] Code format / lint
• [ ] Docs have been reviewed and added

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [X] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the new behavior?

• First version at development branch

Does this introduce a breaking change?

• [X] Yes
• [ ] No

First version at development branch