Add changelog

changelog/unreleased/refactor-naming.md

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+Change: Rename endpoints and message types
+
+We decided to rename endpoints and message types to be less verbose. Specifically, `SettingsBundle` became `Bundle`,
+`Setting` (inside a bundle) kept its name and `SettingsValue` became `Value`.
+
+https://github.com/owncloud/ocis-settings/issues/36
+https://github.com/owncloud/ocis-settings/issues/32
+https://github.com/owncloud/ocis-settings/pull/46

changelog/unreleased/switch-to-uuids.md

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+Change: Use UUIDs instead of alphanumeric identifiers
+
+`Bundles`, `Settings` and `Values` were identified by a set of alphanumeric identifiers so far. We switched to UUIDs
+in order to achieve a flat file hierarchy on disk. Referencing the respective entities by their alphanumeric
+identifiers (as used in UI code) is still supported.
+
+https://github.com/owncloud/ocis-settings/pull/46