Fix: Better error handling for missing Google OAuth credentials

- Add .env.example with required environment variables
- Add helpful warning message when google_client_id/secret are missing
- Update steps_to_run.md with detailed setup instructions
- Include instructions for creating Google OAuth credentials

Addresses #9

server/.env.example

@@ -0,0 +1,12 @@
+# Flask Configuration
+FLASK_ENV=dev
+FLASK_APP=webserver.py
+SECRET_KEY=your-secret-key-here
+
+# Google OAuth Credentials (for user authentication)
+# Get these from https://console.cloud.google.com/apis/credentials
+google_client_id=your-google-client-id
+google_client_secret=your-google-client-secret
+
+# OpenAI API Key (users can also add this in the UI)
+# OPENAI_API_KEY=sk-your-openai-api-key