pw-mon: add page

pages/linux/pw-mon.md

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+# pw-mon
+
+> Monitor objects on the PipeWire instance.
+> More information: <https://docs.pipewire.org/page_man_pw-mon_1.html>.
+
+- Monitor the default PipeWire instance:
+
+`pw-mon`
+
+- Monitor a specific remote instance:
+
+`pw-mon --remote={{remote_name}}`
+
+- Monitor the default instance specifying a color configuration:
+
+`pw-mon --color={{never|always|auto}}`
+
+- Show help:
+
+`pw-mon --help`