Add prettier

package.json

@@ -6,16 +6,24 @@
   "build": {
     "appId": "dev.kruhlmann.imgfloat",
     "productName": "Imgfloat",
-    "files": [ "src/main/node/app.js" ],
+    "files": [
+      "src/main/node/app.js"
+    ],
     "asar": false,
-    "directories": { "output": "dist" },
+    "directories": {
+      "output": "dist"
+    },
     "linux": {
-      "target": ["AppImage"],
+      "target": [
+        "AppImage"
+      ],
       "category": "Utility",
       "icon": "src/main/resources/assets/icon/raw_icon.png"
     },
     "win": {
-      "target": ["nsis"],
+      "target": [
+        "nsis"
+      ],
       "icon": "src/main/resources/assets/icon/appicon.ico"
     },
     "nsis": {
@@ -34,6 +42,7 @@
   },
   "devDependencies": {
     "electron": "^35.7.5",
-    "electron-builder": "^24.13.3"
+    "electron-builder": "^24.13.3",
+    "prettier": "^3.7.4"
   }
 }