Add swaybar_status_actor as binary

src/syndicate/unix/swaybar_status_actor.nim

@@ -1,7 +1,11 @@
 # SPDX-FileCopyrightText: ☭ 2022 Emery Hemingway
 # SPDX-License-Identifier: Unlicense
 
-## See the swaybar-protocol(7) manpage.
+## This is a program that can be used by swaybar in place of i3status.
+## It will pass on to swaybar the assertions it observers in the form
+## of `<swaybar-status { "full_text": "…" … }>`.
+
+## See the swaybar-protocol(7) manpage for further documentation.
 
 import std/[asyncdispatch, json, os, strutils]
 import preserves, preserves/jsonhooks