Add Google OAuth authentication system (#4)

Co-authored-by: Stephen Minakian <stephenminakian@gmail.com>
Co-committed-by: Stephen Minakian <stephenminakian@gmail.com>

.env.example

@@ -0,0 +1,20 @@
+# MongoDB Connection
+MONGO_URI=mongodb://username:password@host:27017
+
+# Google OAuth Credentials (from Google Cloud Console)
+GOOGLE_CLIENT_ID=your-client-id.apps.googleusercontent.com
+GOOGLE_CLIENT_SECRET=your-client-secret
+GOOGLE_CALLBACK_URL=https://apartments.maverickapplications.com/api/auth/google/callback
+
+# JWT Configuration
+# Generate with: node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"
+JWT_SECRET=generate-a-secure-random-string-minimum-32-characters
+
+# Application URLs
+FRONTEND_URL=https://apartments.maverickapplications.com
+
+# Activity Logging Level: all, navigation, none
+ACTIVITY_LOG_LEVEL=all
+
+# Node Environment
+NODE_ENV=production