Added class.

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = false
+insert_final_newline = false

crypto-qr-code-wp.php

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+<?php
+/*
+Plugin Name: Crypto QR Code WP
+Plugin URI: https://www.dopethemes.com/downloads/crypto-qr-code-wp/
+Description: Add cryptocurrencies QR code donate lightbox.
+Author: DopeThemes
+Author URI: https://www.dopethemes.com/
+Text Domain: crypto-qr-code-wp
+Version: 1.0.0
+License: GPLv3
+License URI: license.txt
+Domain Path: /lang
+*/
+
+/*
+    Copyright DopeThemes
+
+    This program 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 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+*/
+
+if( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
+
+if( ! class_exists('crypto_qr_code_wp') ) :
+
+class crypto_qr_code_wp {
+
+	/*
+	*  __construct
+	*
+	*  A dummy constructor to ensure Crypto QR Code WP is only initialized once
+	*
+	*  @type	function
+	*  @date	03/24/19
+	*  @since	1.0.0
+	*
+	*  @param	N/A
+	*  @return	N/A
+	*/
+	public function __construct() {
+		/* Do nothing here */
+	}
+
+	/*
+	*  initialize
+	*
+	*  The real constructor to initialize Crypto QR Code WP
+	*
+	*  @type	function
+	*  @date	03/24/19
+	*  @since	1.0.0
+	*
+	*  @param	N/A
+	*  @return	N/A
+	*/
+	public function initialize() {
+		// parameters.
+		$this->settings = array(
+			'name'		 => esc_html__( 'Crypto QR Code WP', 'crypto-qr-code-wp' ),
+			'version'	 => '1.0.0',
+			'menu_slug'	 => 'turnoff_rest_api_settings',
+			'permission' => 'manage_options',
+			'basename'	 => plugin_basename( __FILE__ ),
+			'path'	     => plugin_dir_path( __FILE__ ),
+			'dir'	     => plugin_dir_url( __FILE__ )
+		);
+	}
+}
+
+/*
+*  crypto_qr_code_wp
+*
+*  The main function responsible for returning the one true crypto_qr_code_wp Instance to functions everywhere.
+*  Use this function like you would a global variable, except without needing to declare the global.
+*
+*  Example: <?php $crypto_qr_code_wp = crypto_qr_code_wp(); ?>
+*
+*  @type	function
+*  @date	03/24/19
+*  @since	1.0.0
+*
+*  @param	N/A
+*  @return	(object)
+*/
+function crypto_qr_code_wp() {
+	global $crypto_qr_code_wp;
+	if( ! isset($crypto_qr_code_wp) ) {
+		$crypto_qr_code_wp = new crypto_qr_code_wp();
+		$crypto_qr_code_wp->initialize();
+    }
+
+	return $crypto_qr_code_wp;
+}
+
+// initialize
+crypto_qr_code_wp();
+
+endif; // class_exists check

readme.txt

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+=== Crypto QR Code WP ===
+Contributors: ksym04
+Tags: crypto, bitcoin, cryptocurrency, qr code
+Requires at least: 4.7
+Tested up to: 4.8.3
+Stable tag: 1.0.0
+License: GPLv3
+
+Add cryptocurrencies QR code donate lightbox
+
+== Description ==
+
+== Language Support ==
+
+== Installation ==
+
+== Frequently Asked Questions ==
+
+== Screenshots ==
+
+== Changelog ==
+
+= 1.0.0 =
+* Initial Release