SwissQR: add Sprain\SwissQrBill and dependencies

htdocs/includes/endroid/qr-code/src/QrCodeInterface.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Endroid\QrCode;
+
+use Endroid\QrCode\Color\ColorInterface;
+use Endroid\QrCode\Encoding\EncodingInterface;
+use Endroid\QrCode\ErrorCorrectionLevel\ErrorCorrectionLevelInterface;
+use Endroid\QrCode\RoundBlockSizeMode\RoundBlockSizeModeInterface;
+
+interface QrCodeInterface
+{
+    public function getData(): string;
+
+    public function getEncoding(): EncodingInterface;
+
+    public function getErrorCorrectionLevel(): ErrorCorrectionLevelInterface;
+
+    public function getSize(): int;
+
+    public function getMargin(): int;
+
+    public function getRoundBlockSizeMode(): RoundBlockSizeModeInterface;
+
+    public function getForegroundColor(): ColorInterface;
+
+    public function getBackgroundColor(): ColorInterface;
+}