fix: add README

README.md

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+# AWS CDK starter project - Configuration, multiple environments and GitHub CI/CD
+
+> [!IMPORTANT]
+> This the code base for a blog post: https://rehanvdm.com/blog/aws-cdk-starter-configuration-multiple-environments-cicd
+
+This blog will go through the thought process and reasoning involved in setting up a CDK starter project.
+We will cover topics like configuration, environments, build systems, CI/CD processes and GitHub Workflows.
+
+> [!IMPORTANT]
+> Read more here: https://rehanvdm.com/blog/aws-cdk-starter-configuration-multiple-environments-cicd