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/dedent/README.md

@@ -0,0 +1,59 @@
+# Dedent
+
+An ES6 string tag that strips indentation from multi-line strings.
+
+## Usage
+
+```js
+import dedent from "dedent";
+
+function usageExample() {
+  const first = dedent`A string that gets so long you need to break it over
+                       multiple lines. Luckily dedent is here to keep it
+                       readable without lots of spaces ending up in the string
+                       itself.`;
+
+  const second = dedent`
+    Leading and trailing lines will be trimmed, so you can write something like
+    this and have it work as you expect:
+
+      * how convenient it is
+      * that I can use an indented list
+         - and still have it do the right thing
+
+    That's all.
+  `;
+
+  const third = dedent(`
+    Wait! I lied. Dedent can also be used as a function.
+  `);
+
+  return first + "\n\n" + second + "\n\n" + third;
+}
+```
+
+```js
+> console.log(usageExample());
+```
+
+```
+A string that gets so long you need to break it over
+multiple lines. Luckily dedent is here to keep it
+readable without lots of spaces ending up in the string
+itself.
+
+Leading and trailing lines will be trimmed, so you can write something like
+this and have it work as you expect:
+
+  * how convenient it is
+  * that I can use an indented list
+    - and still have it do the right thing
+
+That's all.
+
+Wait! I lied. Dedent can also be used as a function.
+```
+
+## License
+
+MIT