chore: add .env.example template

.env.example

@@ -0,0 +1,17 @@
+# App Configuration
+VITE_PUBLIC_URL=http://localhost:3000
+
+# Database Configuration
+# Format: postgresql://USER:PASSWORD@HOST:PORT/DATABASE?schema=public
+DATABASE_URL="postgresql://user:password@localhost:5432/dbname?schema=public"
+
+# Authentication (Better Auth)
+# Generate a secret key (e.g., using 'openssl rand -hex 32')
+BETTER_AUTH_SECRET="your_secret_key_here"
+
+# OAuth Providers (Examples)
+GITHUB_CLIENT_ID="your_github_client_id"
+GITHUB_CLIENT_SECRET="your_github_client_secret"
+
+# Admin Configuration
+ADMIN_EMAIL="admin@example.com"