update readme and add webhook php script

README.md

@@ -5,3 +5,6 @@ super simple bot
 it:
 * responds to pings
 * sends a message to #tilderadio when `$now_playing_file` changes
+
+drop webhook.php somewhere in a webroot and update `now_playing_file` in bot.properties to point to now_playing.txt in that dir.
+

webhook.php

@@ -0,0 +1,6 @@
+<?php
+// this makes a lot of assumptions but it works with azuracast webhooks
+file_put_contents(
+    "now_playing.txt",
+    json_decode(file_get_contents('php://input'))->now_playing->song->text
+);