Add environment variables sample file

env.sample

@@ -0,0 +1,21 @@
+# FastAPI Environment Variables
+# Copy this file to .env and update the values as needed
+
+# Application Configuration
+APP_HOST=0.0.0.0
+APP_PORT=8000
+APP_DEBUG=false
+
+# Database Configuration
+DATABASE_URL=sqlite:////app/storage/db/db.sqlite
+
+# Security Configuration
+SECRET_KEY=your-secret-key-here-change-in-production
+ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+
+# CORS Configuration
+CORS_ORIGINS=*
+
+# Application Environment
+ENVIRONMENT=development