hcitool: add page (#6311)

pages/linux/hcitool.md

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+# hcitool
+
+> Monitor, configure connections, and send special commands to Bluetooth devices.
+> More information: <https://manned.org/hcitool>.
+
+- Scan for Bluetooth devices:
+
+`hcitool scan`
+
+- Output the name of a device, returning its MAC address:
+
+`hcitool name {{bdaddr}}`
+
+- Fetch information about a remote Bluetooth device:
+
+`hcitool info {{bdaddr}}`
+
+- Check the link quality to a Bluetooth device:
+
+`hcitool lq {{bdaddr}}`
+
+- Modify the transmit power level:
+
+`hcitool tpl {{bdaddr}} {{0|1}}`
+
+- Display the link policy:
+
+`hcitool lp`
+
+- Request authentication with a specific device:
+
+`hcitool auth {{bdaddr}}`
+
+- Display local devices:
+
+`hcitool dev`