doc: add notmuch-properties(7)

[notmuch] / doc / man7 / notmuch-properties.rst

diff --git a/doc/man7/notmuch-properties.rst b/doc/man7/notmuch-properties.rst
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+==================
+notmuch-properties
+==================
+
+SYNOPSIS
+========
+
+**notmuch** **count** **property:**\ <*key*>=<*value*>
+
+**notmuch** **search** **property:**\ <*key*>=<*value*>
+
+**notmuch** **show** **property:**\ <*key*>=<*value*>
+
+**notmuch** **reindex** **property:**\ <*key*>=<*value*>
+
+**notmuch** **tag** +<*tag*> **property:**\ <*key*>=<*value*>
+
+
+**notmuch** **dump** **--include=properties**
+
+**notmuch** **restore** **--include=properties**
+
+DESCRIPTION
+===========
+
+Several notmuch commands can search for, modify, add or remove
+properties associated with specific messages.  Properties are
+key/value pairs, and a message can have more than one key/value pair
+for the same key.
+
+While users can select based on a specific property in their search
+terms with the prefix **property:**, the notmuch command-line
+interface does not provide mechanisms for modifying properties
+directly to the user.
+
+Instead, message properties are expected to be set and used
+programmatically, according to logic in notmuch itself, or in
+extensions to it.
+
+Extensions to notmuch which make use of properties are encouraged to
+report the specific properties used to the upstream notmuch project,
+as a way of avoiding collisions in the property namespace.
+
+SEE ALSO
+========
+
+**notmuch(1)**,
+**notmuch-dump(1)**,
+**notmuch-insert(1)**,
+**notmuch-new(1)**,
+**notmuch-reindex(1)**,
+**notmuch-restore(1)**,
+***notmuch-search-terms(7)**