Add aws-cdk-gen to Scaffolding section

[alzateja]

Requirements for your pull request

• Use the following format: [library](link) - Description.
• The text of the link should be the name of the package or project.
• If you add a construct published in multiple languages via JSII, the link should point to the source repository, not to npm, PyPI etc
• Add one link per pull-request.
• Keep descriptions concise, clear and simple, and end them with a period / stop.
• New categories, or improvements to the existing ones are also welcome.
• Make sure your text editor is set to remove trailing whitespace.
• It is desirable for the whole thing to fit on one line after getting rendered by GitHub.

[kalaiser]

Hi @alzateja - I'm afraid your repository doesn't seems to be active over the recent months and its either popular enough hence I'm closing your PR. Thank you for your participation.