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/@svgr/babel-plugin-add-jsx-attribute/README.md

@@ -0,0 +1,37 @@
+# @svgr/babel-plugin-add-jsx-attribute
+
+## Install
+
+```
+npm install --save-dev @svgr/babel-plugin-add-jsx-attribute
+```
+
+## Usage
+
+**.babelrc**
+
+```json
+{
+  "plugins": [
+    [
+      "@svgr/babel-plugin-add-jsx-attribute",
+      {
+        "elements": ["svg"],
+        "attributes": [
+          {
+            "name": "width",
+            "value": "200",
+            "spread": false,
+            "literal": false,
+            "position": "end"
+          }
+        ]
+      }
+    ]
+  ]
+}
+```
+
+## License
+
+MIT