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# Plugin Development
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Creating custom apps, extending entities, adding custom fields, and integrating third-party services.
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## Capabilities
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### App Configuration
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```python { .api }
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class CremeAppConfig(AppConfig):
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    """
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    Base configuration class for Creme CRM applications.
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    Methods:
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    - register_entity_models(): Register entity models
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    - register_bricks(): Register dashboard bricks/widgets
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    - register_menu_entries(): Register navigation menu items
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    - register_custom_forms(): Register custom form layouts
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    """
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```
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### Custom Entity Development
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```python { .api }
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# Example custom entity
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class CustomProduct(CremeEntity):
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    """
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    Custom product entity extending base CRM functionality.
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    Attributes:
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    - name: str, product name
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    - custom_field: str, business-specific field
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    """
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    name = models.CharField(max_length=100)
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    custom_field = models.TextField(blank=True)
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    class Meta:
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        app_label = 'my_custom_app'
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        verbose_name = 'Custom Product'
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        verbose_name_plural = 'Custom Products'
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```