adds js-intro

code/js/.gitignore

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+**/node_modules
+**/dist
+**/.vscode

code/js/js-intro/.prettierrc

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+{
+    "arrowParens": "avoid",
+    "endOfLine": "lf",
+    "semi": true,
+    "printWidth": 120,
+    "singleQuote": true,
+    "tabWidth": 2,
+    "trailingComma": "es5",
+    "useTabs": false,
+    "htmlWhitespaceSensitivity": "ignore"
+  }

code/js/js-intro/eslint.config.mjs

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+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default [
+  { files: ['**/*.{js,mjs,cjs,ts,jsx,tsx}'] },
+  { languageOptions: { globals: globals.browser } },
+  pluginJs.configs.recommended,
+  ...tseslint.configs.recommended,
+];