busctl: add page (#10271)

* busctl: add page

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/linux/busctl.md

@@ -0,0 +1,32 @@
+# busctl
+
+> Introspect and monitor the D-Bus bus.
+> More information: <https://www.freedesktop.org/software/systemd/man/busctl.html>.
+
+- Show all peers on the bus, by their service names:
+
+`busctl list`
+
+- Show process information and credentials of a bus service, a process, or the owner of the bus (if no parameter is specified):
+
+`busctl status {{service|pid}}`
+
+- Dump messages being exchanged. If no service is specified, show all messages on the bus:
+
+`busctl monitor {{service1 service2 ...}}`
+
+- Show an object tree of one or more services (or all services if no service is specified):
+
+`busctl tree {{service1 service2 ...}}`
+
+- Show interfaces, methods, properties and signals of the specified object on the specified service:
+
+`busctl introspect {{service}} {{path/to/object}}`
+
+- Retrieve the current value of one or more object properties:
+
+`busctl get-property {{service}} {{path/to/object}} {{interface_name}} {{property_name}}`
+
+- Invoke a method and show the response:
+
+`busctl call {{service}} {{path/to/object}} {{interface_name}} {{method_name}}`