Create changelog.md

Author: rmocanu-ionos

docs/changelog.md

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+# Changelog
+
+## 1.0.0
+### Initial release
+An enterprise-grade Database is provided as a Service (DBaaS) solution that
+can be managed through a browser-based \"Data Center Designer\" (DCD) tool or
+via an easy to use API.
+
+The API allows you to create additional MariaDB database clusters or modify existing
+ones. It is designed to allow users to leverage the same power and
+flexibility found within the DCD visual tool. Both tools are consistent with
+their concepts and lend well to making the experience smooth and intuitive.