Added Env Examples

Author: V-Silpin

backend/.env.example

@@ -0,0 +1,34 @@
+# Database Configuration
+# Copy this file to .env and fill in your actual values
+
+# PostgreSQL Database Configuration
+DB_NAME=postgres
+DB_HOST=localhost
+DB_USER=postgres
+DB_PASS=postgres
+DB_PORT=5432
+
+# Alternative: Full Database URL (overrides individual settings above)
+# DATABASE_URL=postgresql://username:password@localhost:5432/dbname
+
+# Example configurations for different environments:
+
+# Local Development
+# DB_NAME=crud_api_dev
+# DB_HOST=localhost
+# DB_USER=postgres
+# DB_PASS=your_password
+# DB_PORT=5432
+
+# Docker Compose (with PostgreSQL service)
+# DB_NAME=crud_api
+# DB_HOST=postgres
+# DB_USER=postgres
+# DB_PASS=postgres
+# DB_PORT=5432
+
+# Cloud PostgreSQL (example for Railway, Heroku, etc.)
+# DATABASE_URL=postgresql://username:password@hostname:port/database
+
+# Testing Environment
+# DATABASE_URL=postgresql://postgres:postgres@localhost:5432/test_db