Add CHANGELOG file for Releases (#2887)

CHANGELOG.md

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+<!-- @format -->
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+# Changelog
+
+## Release v0.30.0
+
+Features:
+
+- Added MinIO Console Help Menu
+- Updated UI Menu components
+
+Bug Fix:
+
+- Disable the Upload button on Object Browser if the user is not allowed
+- Fixed security vulnerability for `lestrrat-go/jwx` and `fast-xml-parser`
+- Fixed bug on sub-paths for Object Browser
+- Reduce the number of calls to `/session` API endpoint to improve performance
+- Rolled back the previous change for the Share File feature to no longer ask for Service Account access keys