Added the description to changelog/unreleased

changelog/unreleased/pull-4276

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+Enhancement: Implement web server to browse snapshots
+
+Currently the canonical way of browsing a repository's snapshot to view
+or restore files is `mount`. Unfortunately `mount` depends on fuse which
+is not available on all operating systems.
+
+The new `restic serve` command presents a web interface to browse a
+repository's snapshots. It allows to view and download individual files
+or group of files (as an archive) from snapshots.
+
+https://github.com/restic/restic/pull/4276
+https://github.com/restic/restic/issues/60