examples: added sentry-metrics example

examples/sentry-metrics/README.md

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+# Sentry Metrics
+
+This app connects you to a chatbot powered by GPT-4. It provides TTFB (Time-To-First-Byte) and processing metrics to Sentry.
+
+## Get started
+
+```python
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+
+cp env.example .env # and add your credentials
+
+```
+
+## Run the server
+
+```bash
+python server.py
+```
+
+Then, visit `http://localhost:7860/` in your browser to start a chatbot session.
+
+## Build and test the Docker image
+
+```
+docker build -t chatbot .
+docker run --env-file .env -p 7860:7860 chatbot
+```