linux: added wayland basics for idling and locking screen

wiki/linux/swayidle.md

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+# swayidle
+
+swayidle is an idle manager for [Wayland](/wiki/linux/wayland.md).
+
+## Installation
+
+On most Linux distributions swayidle can be installed with the `swayidle` package.
+
+## Usage
+
+To run swayidle it has to be called - preferably after the boot process.
+An example of this will look like the following.
+This will [suspend-then-hibernate](/wiki/linux/systemd.md#change-suspend-and-hibernate-behaviour)
+the system after 30 seconds.
+Additionally a program [xss-lock](/wiki/linux/xss-lock.md) has to be used to let swayidle know to
+use a specific lock command.
+
+```sh
+#!/bin/sh
+
+exec swayidle -w \
+         timeout 30 'systemctl suspend-then-hibernate'
+```

wiki/linux/wayland.md

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+# Wayland 
+
+[Wayland](https://wayland.freedesktop.org/) is a replacement for the
+[X11 window system](/wiki/linux/x_window_system.md).

wiki/linux/xss-lock.md

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+# xss-lock
+
+xss-lock is an external screen locker for [X11 Window Systems](/wiki/linux/x_window_system.md).
+Using xwayland it can also be used for [Wayland](/wiki/linux/wayland.md) systems.
+
+## Installation
+
+On most Linux distributions swayidle can be installed with the `xss-lock` package.
+
+## Usage
+
+To run xss-lock it has to be called - preferably after the boot process.
+An example of this will look like the following.
+This command makes the system use `swaylock` if the system is put to
+[sleep](/wiki/linux/systemd.md#change-suspend-and-hibernate-behaviour).
+
+```sh
+xss-lock -- swaylock
+```