feat: initialize Tab Shooter Chrome extension game

manifest.json

@@ -0,0 +1,25 @@
+{
+  "manifest_version": 3,
+  "name": "Tab Shooter",
+  "version": "1.0.0",
+  "description": "Schließe deine offenen Tabs, indem du sie wie ein Raumschiff-Pilot abschießt. Ein kleines Minigame für Tab-Hoarder.",
+  "permissions": ["tabs", "storage", "favicon"],
+  "optional_permissions": ["windows"],
+  "action": {
+    "default_popup": "popup.html",
+    "default_title": "Tab Shooter – Tabs abschießen",
+    "default_icon": {
+      "16": "icons/icon16.png",
+      "48": "icons/icon48.png",
+      "128": "icons/icon128.png"
+    }
+  },
+  "icons": {
+    "16": "icons/icon16.png",
+    "48": "icons/icon48.png",
+    "128": "icons/icon128.png"
+  },
+  "background": {
+    "service_worker": "background.js"
+  }
+}