update readme

Author: Puskar-Roy

README.md

@@ -69,6 +69,14 @@ Here's why:
   - 🔄 Live reload for efficient development
   - 🛠 Optimized code for production
 
+- **Security Measures Added:**
+  - 🔐 Helmet for setting up security headers
+  - 🔒 XSS protection with xss-clean middleware
+  - 🚧 HTTP Parameter Pollution (HPP) protection
+  - 🧼 MongoDB data sanitization with express-mongo-sanitize
+  - 🚦 Rate limiting with express-rate-limit for protection against brute-force attacks
+  - 🌐 CORS (Cross-Origin Resource Sharing) configured to allow requests only from a specific origin  
+
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