Add changeset file

Author: tjb346

.changeset/enumerate_duplicate_model_names.md

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+# Enumerate duplicate model names
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+#1212 by @tjb346
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+This addresses: https://github.com/openapi-generators/openapi-python-client/issues/652
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+Even with `use_path_prefixes_for_title_model_names` set to `true`, duplicate model class names can occur. By default, when duplicates are encountered they will be skipped. This can cause error when they are referenced later.
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+This enables setting `enumerate_duplicate_model_names` to `true` (`false` by default) in the config file which will result in a number being added to duplicate names starting with 1. For instance, if there are multiple occurrences in the schema of `MyModelName`, the initial occurrence will remain `MyModelName` and subsequent occurrences will be named `MyModelName1`, `MyModelName2` and so on.