chore(documentation): document installation instructions

src/ports/sway/templates/README.md

@@ -1,9 +1,14 @@
 {{{ basic-heading }}}
 
 # Installation
-1. Write the step one
-2. Write the step two
-... Write the other steps.
+[`aura-theme.conf`](aura-theme.conf) has to be included in your Sway configuration. There are several options:
+
+* 1. Save the file (e.g. to `${XDG_CONFIG_HOME}/sway/aura-theme.conf`).
+  2. Include it in your Sway config (probably `${XDG_CONFIG_HOME}/sway/config`), by putting `include ${XDG_CONFIG_HOME}/sway/aura-theme.conf` somewhere.
+* 1. Copy the contents of [`aura-theme.conf`](aura-theme.conf).
+  2. Insert them somewhere into your Sway config (probably `${XDG_CONFIG_HOME}/sway/config`).
+* 1. Save [`aura-theme.conf`](aura-theme.conf) to your Sway drop-in directory (e.g. `${XDG_CONFIG_HOME}/sway/config.d` or `/etc/sway/config.d`).
+  2. Include the drop-in directory in you Sway config (probably `${XDG_CONFIG_HOME}/sway/config`), by putting `include ${XDG_CONFIG_HOME}/sway/config.d/*` somewhere.
 
 # Contributors
 <table>