Actualizar la configuración del README.md, agregar archivo .env.example y mejorar el .gitignore

.env.example

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+# Microsoft E5 Auto-Renewal Configuration
+# Copy this file to .env and fill in your actual values
+# DO NOT commit .env to version control
+
+# === Engine (odengin) Configuration ===
+# Microsoft Azure credentials
+E5_CLIENT_ID=your_client_id_here
+E5_CLIENT_SECRET=your_client_secret_here
+E5_REFRESH_TOKEN=your_refresh_token_here
+
+# Web application passwords
+WEB_APP_PASSWORD=your_secure_password_here
+E5_WEB_APP_PASSWORD=your_e5_password_here
+
+# === Cron Service (odcron) Configuration ===
+# Engine connection
+CRON_IP=odengin:8080
+
+# Authentication
+CRON_PASSWORD=your_cron_password_here
+CRON_REFRESH_TOKEN=your_cron_refresh_token_here