Added xinput command for Linux

The xinput utility is useful when you want to turn off a input device (laptop keyboard, for example).

pages/linux/xinput.md

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+# xinput
+
+> a utility to list available input devices, query information about a device and change input device settings
+
+- List all input devices.
+
+`xinput list`
+
+- Disconnect an input from a master.
+
+`xinput float {{id}}`
+
+- Reattach an input as slave to a master
+
+`xinput float {{id}} {{master id}}`