added new eslint config file

eslint.config.cjs

@@ -0,0 +1,48 @@
+const html = require('eslint-plugin-html');
+const globals = require('globals');
+const js = require('@eslint/js');
+
+const {
+	FlatCompat,
+} = require('@eslint/eslintrc');
+
+const compat = new FlatCompat({
+	baseDirectory: __dirname,
+	recommendedConfig: js.configs.recommended,
+	allConfig: js.configs.all
+});
+
+module.exports = [...compat.extends('eslint:recommended'), {
+	plugins: {
+		html,
+	},
+
+	languageOptions: {
+		globals: {
+			...globals.node,
+			...globals.mocha,
+			...globals.jquery,
+		},
+
+		ecmaVersion: 2018,
+		sourceType: 'commonjs',
+	},
+
+	rules: {
+		indent: ['error', 'tab', {
+			SwitchCase: 1,
+		}],
+
+		'no-console': 'off',
+		'no-var': 'error',
+		'no-trailing-spaces': 'error',
+		'prefer-const': 'error',
+
+		quotes: ['error', 'single', {
+			avoidEscape: true,
+			allowTemplateLiterals: true,
+		}],
+
+		semi: ['error', 'always'],
+	},
+}];