docs: add back changelog

Author: larskemper

CHANGELOG.md

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+# 2.1.0
+- NEXT-40431 - Compatibility with Shopware 6.7.
+- NEXT-40431 - Increased the minimum required Shopware version to 6.6.x or 6.7.x.
+- NEXT-40431 - Implemented staged execution for demo data generation and deletion to avoid foreign key constraint violations.
+
+# 2.0.1
+- NEXT-32194 - Compatibility with Shopware 6.6
+
+# 2.0.0
+- NEXT-25677 - Compatibility with Shopware 6.5
+- NEXT-25677 - Demodata is now deleted on deactivation
+
+# 1.0.9
+- Add pipeline
+- Add dev tooling
+- Fix plugin validation errors
+- Fixed plugin activation by CMS page renaming