Add model documentation

docs/models/extras/notification.md

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+# Notification
+
+A notification alerts a user that a specific action has taken place in NetBox, such as an object being modified or a background job completing. A notification may be generated via a user's [subscription](./subscription.md) to a particular object, or by an event rule targeting a [notification group](./notificationgroup.md) of which the user is a member.
+
+## Fields
+
+### User
+
+The recipient of the notification.
+
+### Object
+
+The object to which the notification relates.
+
+### Event Type
+
+The type of event indicated by the notification.

docs/models/extras/notificationgroup.md

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+# Notification Group
+
+A set of NetBox users and/or groups of users identified as recipients for certain [notifications](./notification.md).
+
+## Fields
+
+### Name
+
+The name of the notification group.
+
+### Users
+
+One or more users directly designated as members of the notification group.
+
+### Groups
+
+All users of any selected groups are considered as members of the notification group.

docs/models/extras/subscription.md

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+# Subscription
+
+A record indicating that a user is to be notified of any changes to a particular NetBox object. A notification maps exactly one user to exactly one object.
+
+When an object to which a user is subscribed changes, a [notification](./notification.md) is generated for the user.
+
+## Fields
+
+### User
+
+The subscribed user.
+
+### Object
+
+The object to which the user is subscribed.

mkdocs.yml

@@ -225,8 +225,11 @@ nav:
             - ExportTemplate: 'models/extras/exporttemplate.md'
             - ImageAttachment: 'models/extras/imageattachment.md'
             - JournalEntry: 'models/extras/journalentry.md'
+            - Notification: 'models/extras/notification.md'
+            - NotificationGroup: 'models/extras/notificationgroup.md'
             - SavedFilter: 'models/extras/savedfilter.md'
             - StagedChange: 'models/extras/stagedchange.md'
+            - Subscription: 'models/extras/subscription.md'
             - Tag: 'models/extras/tag.md'
             - Webhook: 'models/extras/webhook.md'
         - IPAM: