docs(desktop): update readme

apps/desktop/README.md

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-# MQTTX Desktop
+# 🖥️ MQTTX Desktop
+
+[MQTTX Desktop](https://mqttx.app) is a cross-platform MQTT 5.0 desktop client, open-sourced by EMQ. It runs on macOS, Linux, and Windows, offering a user-friendly graphical interface that simplifies testing operations with a familiar, chat-like interface.
+
+## 📸 Preview
+
+![mqttx-preview](../../assets/mqttx-preview.png)
+
+## 📚 Documentation
+
+For comprehensive guides on installation, configuration, and usage, visit the [MQTTX Desktop Documentation](https://mqttx.app/docs).
+
+## 📥 Downloads
+
+**[Download MQTTX Desktop](https://mqttx.app/downloads)** from the official downloads page, with versions available for macOS, Windows, and Linux.
+
+## 🛠️ Usage
+
+After installation, MQTTX Desktop is ready to use. Here's a quick overview of basic operations:
+
+- **Create and Manage Connections**: Easily configure connections to various MQTT Brokers.
+- **Publish and Subscribe**: Intuitively publish messages to topics and subscribe to receive messages.
+- **Advanced Features**: Utilize scripts, benchmarks, and IoT data simulation for comprehensive testing and development.
+
+For more detailed instructions and advanced features, check out the [Getting Started guide](https://mqttx.app/docs/get-started).
+
+## ⚙️ Better Together with EMQX
+
+MQTTX Desktop works seamlessly with EMQX, enhancing MQTT solutions with its graphical interface and advanced features.
+
+- [EMQX on AWS MarketPlace →](https://aws.amazon.com/marketplace/pp/prodview-cwa2e6xbrwtzi)
+- [EMQX Kubernetes Operator →](https://www.emqx.com/en/emqx-kubernetes-operator)
+- [EMQX Terraform →](https://www.emqx.com/en/emqx-terraform)
+
+🔓 **Open Source**
+
+```shell
+docker pull emqx/emqx
+docker run -d --name emqx -p 1883:1883 -p 8083:8083 -p 8084:8084 -p 8883:8883 -p 18083:18083 emqx/emqx
+```
+
+- [Download more versions](https://www.emqx.io/downloads)
+
+☁️ **Cloud Serverless**
+
+Start with the cloud serverless MQTT messaging services built on EMQX. Get started for free, with a pay-as-you-go model offering 1M session minutes per month.
+
+- [Try Free](https://www.emqx.com/en/cloud/serverless-mqtt)
+
+## 🌍 Join EMQ Community
+
+- **Stay Updated**: Follow [Twitter @EMQTech](https://twitter.com/EMQTech) for the latest updates.
+- **Ask Questions**: Visit our [discussion forums](https://github.com/emqx/emqx/discussions) for specific queries.
+- **Join Discussions**: Engage with the community on [official Discord](https://discord.gg/xYGf3fQnES).
+- **Watch and Learn**: Subscribe to [EMQX YouTube](https://www.youtube.com/channel/UC5FjR77ErAxvZENEWzQaO5Q) for tutorials and insights.
+
+## 🔨 Develop
+
+Contribute to the development of MQTTX Desktop:
+
+- Recommended Node version: `v18.17`.
+- Ensure [pnpm](https://pnpm.io/) is installed for package management.
+
+```shell
+# Initial setup
+git clone git@github.com:emqx/MQTTX.git
+cd MQTTX
+
+# Install dependencies using pnpm
+pnpm install
+
+# Development and production build commands
+pnpm run dev:desktop
+pnpm run build:desktop
+```
+
+For more information on development and contribution, see the [Development Documentation](https://github.com/emqx/MQTTX/blob/main/.github/CONTRIBUTING.md).
+
+## 🤝 Contributing
+
+Interested in contributing to MQTTX Desktop? Read our [Contributing Guide](https://github.com/emqx/MQTTX/blob/main/.github/CONTRIBUTING.md) for guidelines on how to contribute.
+
+## 💡 Technology Stack
+
+MQTTX Desktop is built using [Electron](https://www.electronjs.org/), [Vue](https://vuejs.org/), [TypeScript](https://www.typescriptlang.org/), and integrates with [MQTT.js](https://github.com/mqttjs/MQTT.js).
+
+## ⚖️ License
+
+MQTTX Desktop is licensed under the Apache License 2.0. For more details, see the [LICENSE](https://github.com/emqx/MQTTX/blob/main/LICENSE).