Create openai.md

guides/openai.md

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+# OpenAI
+
+To use OpenAI with `aisuite`, you’ll need an [OpenAI account](https://platform.openai.com/). After logging in, go to the [API Keys](https://platform.openai.com/account/api-keys) section in your account settings and generate a new key. Once you have your key, add it to your environment as follows:
+
+```shell
+export OPENAI_API_KEY="your-openai-api-key"
+```
+
+## Create a Chat Completion
+
+Install the `openai` Python client:
+
+Example with pip:
+```shell
+pip install openai
+```
+
+Example with poetry:
+```shell
+poetry add openai
+```
+
+In your code:
+```python
+import aisuite as ai
+client = ai.Client()
+
+provider = "openai"
+model_id = "gpt-4-turbo"
+
+messages = [
+    {"role": "system", "content": "You are a helpful assistant."},
+    {"role": "user", "content": "What’s the weather like in San Francisco?"},
+]
+
+response = client.chat.completions.create(
+    model=f"{provider}:{model_id}",
+    messages=messages,
+)
+
+print(response.choices[0].message.content)
+```
+
+Happy coding! If you’d like to contribute, please read our [Contributing Guide](CONTRIBUTING.md).