docs: Create AWS CDK starter kit documentation

[Feeco-Li]

Add AWS CDK starter kit documentation for T3 app deployment.

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✅ Checklist

• I have followed every step in the contributing guide (updated 2022-10-06).
• The PR title follows the convention we established conventional-commit
• I performed a functional test on my final commit

---

Changelog

[Short description of what has changed]

--- I added one file in the /deployment folder for aws deployment using aws cdk.

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[Screenshots]

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Project	Deployment	Actions	Updated (UTC)
create-t3-app	Ready	Preview, Comment	Feb 3, 2026 7:15pm

[crafael23]

This sounds interesting and decent, the way you added the docs is not really there, it would perhaps be good if we could have a cli option to scaffold this instead of just a step by step tutorial, and its corresponding readme files modifications.