chore: add README

Signed-off-by: Martin Matous <m@matous.dev>

README.md

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+# eselect-autostart
+
+[Eselect](https://wiki.gentoo.org/wiki/Project:Eselect) module for managing symlinks to .desktop entries in `$XDG_CONFIG_HOME/autostart`.
+
+## Usage
+
+Unlike most other eselect modules, there's no need to
+run this as root. All files are created in `$HOME` and doing so would pass different `$XDG_CONFIG_HOME` to the script.
+
+To view available .desktop entries use
+```
+eselect autostart list
+```
+To enable starting target application on login use
+```
+eselect autostart enable <TARGET>
+```
+where `TARGET` is either a number from _list_ command
+or entry name directly. Specifying .desktop suffix is not
+necessary. Both of the following will work.
+```
+eselect autostart enable Alacritty
+```
+```
+eselect autostart enable Alacritty.desktop
+```
+While specifying a number from _list_ command is unambiguous
+using filenames is not and symlink will be created to
+the first matching entry according to
+[Desktop Application Autostart Specification](https://specifications.freedesktop.org/autostart-spec/autostart-spec-latest.html).
+
+To prevent an application from being started automatically
+use
+```
+eselect autostart disable Alacritty
+```
+
+## Installation
+
+Copy into eselect's module directory.
+```
+cp ./autostart.eselect /usr/share/eselect/modules/.
+```