Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/lodash/fp/initial.js

@@ -0,0 +1,5 @@
+var convert = require('./convert'),
+    func = convert('initial', require('../initial'), require('./_falseOptions'));
+
+func.placeholder = require('./placeholder');
+module.exports = func;