new file: README.md

modified:   app.php
	renamed:    update.php -> device-api.php
	new file:   integration.php
	deleted:    registration.php
	deleted:    report.php

software/integration.php

@@ -0,0 +1,7 @@
+<?php
+
+// Prometheus metrics endpoint for temperatures.
+$router->get('/metrics', function($req) {
+    http_response_code(200);
+});
+