Add initial extension files for halfPage startpage

- Added icon image for the extension.
- Created manifest.json for extension configuration with permissions and new tab override.
- Implemented sidebar component with user settings for name, search engine, weather location, color scheme, and theme selection.

ext/manifest.json

@@ -0,0 +1,20 @@
+{
+  "manifest_version": 3,
+  "name": "halfPage",
+  "description": "Use halfPage as your Startpage.",
+  "version": "0.0.1",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "halfPage@new-tab.ipv4.army"
+    }
+  },
+  "optional_permissions": [
+    "geolocation"
+  ],
+  "icons": {
+    "64": "icons/icon.png"
+  },
+  "chrome_url_overrides": {
+    "newtab": "dist/index.html"
+  }
+}