docs: Add intro to model API
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*********************************************
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:mod:`mopidy.models` -- Immutable data models
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*********************************************
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********************
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:mod:`mopidy.models`
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********************
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These immutable data models are used for all data transfer within the Mopidy
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backends and between the backends and the MPD frontend. All fields are optional
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and immutable. In other words, they can only be set through the class
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constructor during instance creation.
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Data model relations
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====================
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.. digraph:: model_relations
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Playlist -> Track [ label="has 0..n" ]
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Track -> Album [ label="has 0..1" ]
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Track -> Artist [ label="has 0..n" ]
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Album -> Artist [ label="has 0..n" ]
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Data model API
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==============
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.. automodule:: mopidy.models
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:synopsis: Immutable data models.
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:members:
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:undoc-members:
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Model relations
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===============
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.. digraph:: model_relations
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Playlist -> Track [ label="has multiple" ]
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Track -> Album [ label="has one" ]
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Track -> Artist [ label="has multiple" ]
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Album -> Artist [ label="has multiple" ]
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