add standard stryker config

assets/index.js

@@ -9,5 +9,6 @@
 
 const drone = require ('./drone');
 const jasmine = require ('./jasmine');
+const stryker = require ('./stryker');
 
-module.exports = { drone, jasmine };
+module.exports = { drone, jasmine, stryker };

assets/stryker.js

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) Sapphirecode - All Rights Reserved
+ * This file is part of standard which is released under MIT.
+ * See file 'LICENSE' for full license details.
+ * Created by Timo Hocker <timo@scode.ovh>, October 2020
+ */
+
+'use strict';
+
+module.exports = `'use strict';
+
+/**
+ * @type {import('@stryker-mutator/api/core').StrykerOptions}
+ */
+module.exports = {
+  mutator:          'javascript',
+  packageManager:   'yarn',
+  reporters:        [
+    'clear-text',
+    'progress'
+  ],
+  testRunner:        'jasmine',
+  testFramework:     'jasmine',
+  jasmineConfigFile: 'jasmine.json',
+  transpilers:       [],
+  coverageAnalysis:  'perTest',
+  mutate:            [ 'index.js' ]
+};
+`;