Upgrade to some new nextcloud standards

lib/Db/NoteShare.php

@@ -0,0 +1,22 @@
+<?php
+namespace OCA\QuickNotes\Db;
+
+use JsonSerializable;
+
+use OCP\AppFramework\Db\Entity;
+
+class NoteShare extends Entity implements JsonSerializable {
+
+	protected $noteId;
+	protected $sharedUser;
+	protected $sharedGroup;
+
+	public function jsonSerialize() {
+		return [
+			'id' => $this->id,
+			'noteid' => $this->noteId,
+			'shareduser' => $this->sharedUser,
+			'sharedgroup' => $this->sharedGroup
+		];
+	}
+}