chore: documentation (#76)

* chore: update docstring example to use python code block

* docs: add documentation

* feat: add docs build + fix other workdlows

* fix: add missing return type

docs/module/cli.md

@@ -0,0 +1,77 @@
+# CLI
+
+Typer-based command-line interface for managing your FastAPI application, with built-in fixture loading.
+
+## Installation
+
+=== "uv"
+    ``` bash
+    uv add "fastapi-toolsets[cli]"
+    ```
+
+=== "pip"
+    ``` bash
+    pip install "fastapi-toolsets[cli]"
+    ```
+
+## Overview
+
+The `cli` module provides a `manager` entry point built with [Typer](https://typer.tiangolo.com/). It auto-discovers fixture commands when a [`FixtureRegistry`](../reference/fixtures.md#fastapi_toolsets.fixtures.registry.FixtureRegistry) and a database context are configured.
+
+## Configuration
+
+Configure the CLI in your `pyproject.toml`:
+
+```toml
+[tool.fastapi-toolsets]
+cli = "myapp.cli:cli"           # optional: your custom Typer app
+fixtures = "myapp.fixtures:registry"  # FixtureRegistry instance
+db_context = "myapp.db:db_context"    # async context manager for sessions
+```
+
+All fields are optional. Without configuration, the `manager` command still works but only includes the built-in commands.
+
+## Usage
+
+```bash
+# List available commands
+manager --help
+
+# Load fixtures for a specific context
+manager fixtures load --context testing
+
+# Load all fixtures (no context filter)
+manager fixtures load
+```
+
+## Custom CLI
+
+You can extend the CLI by providing your own Typer app. The `manager` entry point will merge your app's commands with the built-in ones:
+
+```python
+# myapp/cli.py
+import typer
+
+cli = typer.Typer()
+
+@cli.command()
+def hello():
+    print("Hello from my app!")
+```
+
+```toml
+[tool.fastapi-toolsets]
+cli = "myapp.cli:cli"
+```
+
+## Entry point
+
+The `manager` script is registered automatically when the package is installed:
+
+```bash
+manager --help
+```
+
+---
+
+[:material-api: API Reference](../reference/cli.md)