Update readme docs

Author: soren121

README.md

@@ -119,6 +119,11 @@ All rules are off by default. However, you may extend one of the preset configs,
      "eslint:recommended",
      "plugin:import/recommended",
   ],
+  "rules": {
+    "import/no-dynamic-require": "warn",
+    "import/no-nodejs-modules": "warn",
+    // etc...
+  }
 }
 ```
 
@@ -139,7 +144,9 @@ All rules are off by default. However, you may extend one of the preset configs,
 
 ### Config - Flat (`eslint.config.js`)
 
-All rules are off by default. However, you may configure them manually in your `eslint.config.(js|cjs|mjs)`, or extend one of the preset configs:
+All rules are off by default. However, you may extend one of the preset configs, or configure them manually in your `eslint.config.(js|cjs|mjs)`.
+
+ - Extending a preset config:
 
 ```js
 import importPlugin from 'eslint-plugin-import';
@@ -150,17 +157,36 @@ export default [
   importPlugin.flatConfigs.recommended,
   {
     files: ['**/*.{js,mjs,cjs}'],
-    languageOptions: {
-      ecmaVersion: 'latest',
-      sourceType: 'module',
-    },
     rules: {
-      'no-unused-vars': 'off',
       'import/no-dynamic-require': 'warn',
       'import/no-nodejs-modules': 'warn',
     },
   },
 ];
+```
+
+ - Configuring manually:
+
+```js
+import importPlugin from 'eslint-plugin-import';
+import js from '@eslint/js';
+
+export default [
+  js.configs.recommended,
+  {
+    files: ['**/*.{js,mjs,cjs}'],
+    plugins: {
+      import: importPlugin,
+    },
+    rules: {
+      'import/no-unresolved': ['error', { 'commonjs': true, 'amd': true }],
+      'import/named': 'error',
+      'import/namespace': 'error',
+      'import/default': 'error',
+      'import/export': 'error',
+    },
+  },
+];
 ```
 
 ## TypeScript