Added CHANGELOG.md

Author: tdmarco

CHANGELOG.md

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+## What's Changed
+* Updated to use KMS key instead of CMK in https://github.com/aws-samples/aws-system-manager-automation-unencrypted-to-encrypted-resources/pull/2
+* Removed references to “customer master key” (or any reference to “mas… in https://github.com/aws-samples/aws-system-manager-automation-unencrypted-to-encrypted-resources/pull/4
+* remove references to “customer master key” (or any reference to “mast… in https://github.com/aws-samples/aws-system-manager-automation-unencrypted-to-encrypted-resources/pull/6
+* Added EBS in https://github.com/aws-samples/aws-system-manager-automation-unencrypted-to-encrypted-resources/pull/7
+
+**Full Changelog**: https://github.com/aws-samples/aws-system-manager-automation-unencrypted-to-encrypted-resources/commits/v1.0.0