Adding GitHub Action

code/action.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+
+This script processes updates to the https://github.com/ai-robots-txt/ai.robots.txt repository.
+
+It generates:
+
+  - robots.txt
+  - table-of-bot-metrics.md
+
+*/
+
+$robots = json_decode(file_get_contents('robots.json'), 1);
+
+$robots_txt = null;
+$robots_table = '| Name | Operator | Respects `robots.txt` | Data use | Visit regularity | Description |'."\n";
+$robots_table .= '|-----|----------|-----------------------|----------|------------------|-------------|'."\n";
+
+foreach($robots as $robot => $details) {
+  $robots_txt .= 'User-agent: '.$robot."\n";
+  $robots_table .= '| '.$robot.' | '.$details['operator'].' | '.$details['respect'].' | '.$details['function'].' | '.$details['frequency'].' | '.$details['description'].' | '."\n";
+}
+
+$robots_txt .= 'Disallow: /';
+
+file_put_contents('robots.txt', $robots_txt);
+file_put_contents('table-of-bot-metrics.md', $robots_table);