pw-metadata: add page (#12884)

* pw-metadata: add page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/pw-metadata.md

@@ -0,0 +1,33 @@
+# pw-metadata
+
+> Monitor, set, and delete metadata on PipeWire objects.
+> See also: `pipewire`, `pw-mon`, `pw-cli`.
+> More information: <https://docs.pipewire.org/page_man_pw-metadata_1.html>.
+
+- Show metadata in `default` name:
+
+`pw-metadata`
+
+- Show metadata with ID 0 in `settings`:
+
+`pw-metadata {{-n|--name}} {{settings}} {{0}}`
+
+- List all available metadata objects:
+
+`pw-metadata {{-l|--list}}`
+
+- Keep running and log the changes to the metadata:
+
+`pw-metadata {{-m|--monitor}}`
+
+- Delete all metadata:
+
+`pw-metadata {{-d|--delete}}`
+
+- Set `log.level` to 1 in `settings`:
+
+`pw-metadata --name {{settings}} {{0}} {{log.level}} {{1}}`
+
+- Display help:
+
+`pw-metadata --help`