Add changelog entries

changelog/unreleased/align-project-structure.md

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+Change: Align structure of this extension with other extensions
+
+We aim to have a similar project structure for all our ocis extensions. This extension was different with regard to the structure of the server command and naming of some flag names.
+
+https://github.com/owncloud/ocis-accounts/pull/51

changelog/unreleased/user-listing-ui.md

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+Enhancement: Add simple user listing UI
+
+We added an extension for ocis-web that shows a simple list of all existing users.
+
+https://github.com/owncloud/ocis-accounts/pull/51