初始化SSE服务端项目

README.md

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+# SSE - Simple Server-Sent Events
+
+SSE (Server-Sent Events) is a web technology that allows a web server to push data to a web page in real time. It's a simple way to create a real-time, bi-directional communication channel between a web server and a web browser.
+
+## Project Setup
+1. **Create a new directory** for your project:
+2. npm init -y
+3. npm install express
+4. node app.js