add as a contrib plugin

diff --git a/doc/plugins/contrib/transient.mdwn b/doc/plugins/contrib/transient.mdwn
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+[[!template id=plugin name=transient author="[[Simon_McVittie|smcv]]"]]
+[[!template id=gitbranch branch=smcv/ready/transient author="[[Simon_McVittie|smcv]]"]]
+[[!tag type/special-purpose]]
+
+The `transient` plugin is an implementation of [[todo/transient pages]]
+in an underlay. It's mostly useful as something other plugins can depend on;
+[[plugins/contrib/album]] puts photo-album "viewer" pages there,
+and the versions of [[plugins/autoindex]] and [[plugins/tag]] on the
+same branch optionally put their auto-generated pages there.