Add CODEOWNERS file to define code ownership and required reviewers

Author: mwarman

.github/CODEOWNERS

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+# GitHub CODEOWNERS file
+# This file defines code ownership and required reviewers for pull requests
+# Documentation: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+# Default owner for everything in the repository
+* @mwarman
+
+# Infrastructure as Code (AWS CDK)
+/infrastructure/ @mwarman
+
+# GitHub configuration and workflows
+/.github/ @mwarman
+
+# Documentation
+/docs/ @mwarman

.prettierignore

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+.github/CODEOWNERS