Add privacy provider information

This is a null provider

classes/privacy/provider.php

@@ -0,0 +1,30 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace tiny_stash\privacy;
+
+/**
+ * Privacy Subsystem implementation for the stash plugin for TinyMCE.
+ *
+ * @package tiny_stash
+ * @copyright 2023 Adrian Greeve <[email protected]>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements \core_privacy\local\metadata\null_provider {
+    public static function get_reason(): string {
+        return 'privacy:metadata';
+    }
+}

lang/en/tiny_stash.php

@@ -67,6 +67,7 @@
 $string['notrades'] = 'You currently have no trades created';
 $string['pickup'] = 'Pick up!';
 $string['pluginname'] = 'Tiny stash';
+$string['privacy:metadata'] = 'This plugin stores no user data';
 $string['snippetinserter'] = 'Snippet inserter';
 $string['supplies'] = 'Supplies';
 $string['tradehelp'] = 'Trades are a widget that allows students to hand in items in exchange for something else.';