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/detect-newline/readme.md

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+# detect-newline [![Build Status](https://travis-ci.org/sindresorhus/detect-newline.svg?branch=master)](https://travis-ci.org/sindresorhus/detect-newline)
+
+> Detect the dominant newline character of a string
+
+
+## Install
+
+```
+$ npm install detect-newline
+```
+
+
+## Usage
+
+```js
+const detectNewline = require('detect-newline');
+
+detectNewline('foo\nbar\nbaz\r\n');
+//=> '\n'
+```
+
+
+## API
+
+### detectNewline(string)
+
+Returns the detected newline or `undefined` when no newline character is found.
+
+### detectNewline.graceful(unknown)
+
+Returns the detected newline or `\n` when no newline character is found or the input is not a string.
+
+
+## Related
+
+- [detect-newline-cli](https://github.com/sindresorhus/detect-newline-cli) - CLI for this module
+- [detect-indent](https://github.com/sindresorhus/detect-indent) - Detect the indentation of code
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)