feat(Instructor): integrate with SQLModel, provide documentation and example (#418)

Co-authored-by: Jason Liu <jxnl@users.noreply.github.com>

docs/examples/sqlmodel.md

@@ -0,0 +1,65 @@
+# Integrating Instructor with SQLModel
+
+[SQLModel](https://sqlmodel.tiangolo.com/) is a library designed for interacting with SQL databases from Python code using Python objects. `SQLModel` is based on `Pydantic` and `SQLAlchemy` and was created by [tiangolo](https://twitter.com/tiangolo) who also developed `FastAPI`. So you can expect seamless integration across all these libraries, reducing code duplicating and improving your developer experience. 
+
+# Example: Adding responses from Instructor directly to your DB
+
+## Defining the Models
+
+First we'll define a model that will serve as a table for our database and the structure of our outputs from `Instructor`
+
+!!! tips "Model Definition"
+
+    You'll need to subclass your models with both `SQLModel` and `instructor.OpenAISchema` for them to work with SQLModel
+
+```python
+import instructor
+from openai import OpenAI
+from typing import Optional
+from sqlmodel import Field, SQLModel, create_engine
+
+
+class Hero(SQLModel, instructor.OpenAISchema, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str
+    secret_name: str
+    age: Optional[int] = None
+```
+
+## Generating a record
+
+The `create_hero` function will query `OpenAI` for a `Hero` record
+
+```python
+client = instructor.patch(OpenAI())
+
+def create_hero() -> Hero:
+    return client.chat.completions.create(
+        model="gpt-3.5-turbo",
+        response_model=Hero,
+        messages=[
+            {"role": "user", "content": "Make a new superhero"},
+        ],
+    )
+```
+
+## Inserting the response into the DB
+
+```python
+engine = create_engine("sqlite:///database.db")
+SQLModel.metadata.create_all(engine)
+
+hero = create_hero()
+print(hero.model_dump())
+    """
+    {'name': 'SuperNova', 'secret_name': 'Mia Thompson', 'age': 28, 'id': None}
+    """
+
+with Session(engine) as session:
+    session.add(hero)
+    session.commit()
+```
+
+![Image of hero record in the database](db.png)
+
+And there you have it! You can now use the same models for your database and `Instructor` enabling them work seamlessly! Also checkout the [FastAPI](../concepts/fastapi.md) guide to see how you can use these models in an API as well.