Add changelog

changelog/unreleased/role-ids-from-context.md

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+Change: Unwrap roleIDs from access-token into metadata context
+
+We pass the RoleIDs from the access-token into the metadata context.
+
+https://github.com/owncloud/ocis-pkg/pull/59

changelog/unreleased/roles-cache.md

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+Change: Provide cache for roles
+
+In order to work efficiently with permissions we provide a cache for roles and a
+middleware to update the cache based on roleIDs from the metadata context. It can be
+used to check permissions in service handlers.
+
+https://github.com/owncloud/ocis-pkg/pull/59