Add example using node.js

examples/node/.gitignore

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+storage.json

examples/node/README.md

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+# Node.js Example for @aracna/fcm
+
+Please define the following variables inside a .env file.
+
+| Name                        | Source           | Type   |
+| --------------------------- | ---------------- | ------ |
+| VITE_FIREBASE_API_KEY       | Firebase Console | string |
+| VITE_FIREBASE_APP_ID        | Firebase Console | string |
+| VITE_FIREBASE_PROJECT_ID    | Firebase Console | string |
+| VITE_GOOGLE_SERVICE_ACCOUNT | Firebase Console | string |
+| VITE_VAPID_KEY              | Firebase Console | string |
+
+The `VITE_GOOGLE_SERVICE_ACCOUNT` variable must be base64 encoded.
+
+## Install Dependencies
+
+```
+pnpm i
+```
+
+## Register & Listen
+
+This command registers a new device to FCM if not already registered, then connects with the client and listens to any incoming messages.
+
+```
+pnpm start
+```
+
+## Send Test Message
+
+This command will send a test message to the client that is listening when you run `pnpm start`, you should see it appear in its logs once sent.
+
+```
+pnpm send-message
+```

examples/node/package.json

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+{
+  "name": "node",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "send-message": "vite-node src/send-message.ts",
+    "start": "vite-node src/register-and-listen.ts"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@aracna/core": "^1.1.81",
+    "@aracna/fcm": "^1.0.22",
+    "vite": "^5.2.7",
+    "vite-node": "^1.4.0"
+  }
+}