helicone integration docs

docs/tools/HeliconeObservability.md

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+# Helicone
+
+## Description
+
+[Helicone](https://helicone.ai) is a open source developer tool that allows you to easily add caching, ETL with 1 line of code.
+
+Get full visibility into:
+
+- [Metrics](https://www.helicone.ai/) - ex: cost, latency, time to first token, etc...
+- [Fine Tuning](https://docs.helicone.ai/features/advanced-usage/fine-tuning) - Easily export or your data to easily be fine tuned.
+- [ETL](https://docs.helicone.ai/features/advanced-usage/etl) - Move data with any of our connectors (PostHog, Datadog, Segment)
+- [Prompts](https://docs.helicone.ai/features/prompts) - Track your prompt versions auto-magically
+- [Users](https://docs.helicone.ai/custom-parameters/user-tracking) - Keep track of users and limit their usage.
+- [Traces](https://docs.helicone.ai/use-cases/segmentation) - Segment your data via traces and slice and dice your data in various ways.
+
+## Installation
+
+- Get an API key from [helicone.ai](https://helicone.ai) and set it in environment variables (`OPENAI_API_BASE`).
+
+## Example
+
+```python
+os.environ["OPENAI_API_BASE"] = f"https://oai.helicone.ai/{HELICONE_API_KEY}/v1
+```
+
+That is it! Now you will get full visibility into your application.