Add example environment configuration file

.env.example

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+# Django
+SECRET_KEY=django-insecure-change-me
+DEBUG=True
+ALLOWED_HOSTS=localhost,127.0.0.1
+
+# Redis
+REDIS_URL=redis://127.0.0.1:6379/1
+
+# Stripe
+STRIPE_PUBLISHABLE_KEY=
+STRIPE_SECRET_KEY=
+
+# PayPal
+PAYPAL_CLIENT_ID=
+PAYPAL_CLIENT_SECRET=
+PAYPAL_MODE=sandbox
+
+# SMTP
+SMTP_ENDPOINT=smtp.email.eu-paris-1.oci.oraclecloud.com
+SMTP_PORT=587
+SECURITY=tls
+SMTP_USERNAME=
+SMTP_PASSWORD=
+SMTP_EMAIL=
+
+DOMAIN=
+PROTOCOL=
+
+# Logging
+LOG_LEVEL=INFO
+LOG_DIR=logs
+LOG_FILE=app.log