Adding all the API Gateway resources in the readme.md file

[soumyo13]

Signed-off-by: Soumyodeep Karmakar soumyo.k13@gmail.com

Description

Adding all the API Gateway resources in the README.md file

Issues Resolved

List any existing issues this PR resolves or any Discourse or StackOverflow discussion that's relevant

Check List

Please fill a box or appropriate ([x]) or mark N/A.

• [ ] New functionality includes integration tests/controls
• [ ] New Terraform resources
• [ ] Documentation provided or updated for resources
• [ ] All Integration Tests pass
• [ ] All Unit Tests pass
• [ ] rake lint passes
• [x] All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/master/CONTRIBUTING.md#developer-certification-of-origin-dco

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