Add a release notes

Author: Vincent Royer

CDC_Release_Notes.md

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+# Release notes for CDC for Apache Cassandra™
+The CDC for Apache Cassandra™ is compatible for Apache Cassandra™ 3.11, 4.0, and DSE 6.8.
+
+# Release notes for 1.0.3
+17 March 2022
+
+## Changes
+* Add new environment variables for the CDC agent configuration
+* Upgrade to DSE 6.8.18
+* Fix documentation
+
+# Release notes for 1.0.2
+19 January 2022
+
+## Changes
+* Upgrade some dependencies
+
+# Release notes for 1.0.1
+10 December 2021
+
+## Changes
+* Initial release