Draft documentation for model features

docs/plugins/development/model-features.md

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+# Model Features
+
+Plugin models can leverage certain NetBox features by inheriting from designated Python classes (documented below), defined in `netbox.models.features`. These classes perform two crucial functions:
+
+1. Apply any fields, methods, or attributes necessary to the operation of the feature
+2. Register the model with NetBox as utilizing the feature
+
+For example, to enable support for tags in a plugin model, it should inherit from `TagsMixin`:
+
+```python
+# models.py
+from django.db.models import models
+from netbox.models.features import TagsMixin
+
+class MyModel(TagsMixin, models.Model):
+    foo = models.CharField()
+    ...
+```
+
+This will ensure that TaggableManager is applied to the model, and that the model is registered with NetBox as taggable.
+
+!!! note
+    Please note that only the classes which appear in this documentation are currently supported. Although other classes may be present within the `features` module, they are not yet supported for use by plugins.
+
+::: netbox.models.features.CustomLinksMixin
+
+::: netbox.models.features.CustomFieldsMixin
+
+::: netbox.models.features.ExportTemplatesMixin
+
+::: netbox.models.features.JobResultsMixin
+
+::: netbox.models.features.JournalingMixin
+
+::: netbox.models.features.TagsMixin
+
+::: netbox.models.features.WebhooksMixin