chore: move desktop files

desktop/package.json

@@ -0,0 +1,61 @@
+{
+  "name": "vikunja-desktop",
+  "version": "0.21.0",
+  "description": "Vikunja's frontend as a standalone desktop application.",
+  "main": "main.js",
+  "repository": "https://code.vikunja.io/desktop",
+  "license": "GPL-3.0-or-later",
+  "author": {
+    "email": "maintainers@vikunja.io",
+    "name": "Vikunja Team"
+  },
+  "homepage": "https://vikunja.io",
+  "scripts": {
+    "start": "electron .",
+    "pack": "electron-builder --dir",
+    "dist": "electron-builder"
+  },
+  "build": {
+    "appId": "io.vikunja.desktop",
+    "productName": "Vikunja Desktop",
+    "artifactName": "${productName}-${version}.${ext}",
+    "icon": "build/icon.icns",
+    "linux": {
+      "target": [
+        "deb",
+        "AppImage",
+        "snap",
+        "pacman",
+        "apk",
+        "freebsd",
+        "rpm",
+        "zip",
+        "tar.gz"
+      ],
+      "category": "Productivity"
+    },
+    "win": {
+      "target": [
+        "nsis",
+        "portable",
+        "msi",
+        "zip"
+      ]
+    },
+    "mac": {
+      "category": "public.app-category.productivity",
+      "target": [
+        "dmg",
+        "zip"
+      ]
+    }
+  },
+  "devDependencies": {
+    "electron": "28.2.2",
+    "electron-builder": "24.9.1"
+  },
+  "dependencies": {
+    "connect-history-api-fallback": "^2.0.0",
+    "express": "^4.17.1"
+  }
+}