linux: added ly display manager

wiki/linux/ly.md

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+# Ly
+
+[Ly](https://github.com/fairyglade) is a lightweight console UI
+[display manager](/wiki/linux/display_managers.md).
+
+## Setup
+
+On most linux distributions Ly can be installed with the `ly` package.
+
+This setup needs an executable `~/.xinitrc` file.
+If you are not sure about it, use the tests provided in the penultimate step.
+
+Before finishing the setup the functionality should be tested.
+This can be done by using one or both of the following commands. 
+
+```sh 
+systemctl start ly.service
+```
+
+Finally the [SystemD](/wiki/linux/systemd.md) Ly service needs to be enabled and reboot the
+system.
+
+```sh 
+systemctl enable ly.service`
+reboot
+```