Update README.md
Add link to Sling Models documentation
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This module is part of the [Apache Sling](https://sling.apache.org) project.
This bnd plugin detects all Sling Models classes and adds a `Sling-Model-Classes` bundle header to the bundle being built, containing the model class names.
+
+Usage is described in [Sling Models](https://sling.apache.org/documentation/bundles/models.html#registration-of-sling-models-classes-via-bnd-plugin).
