Upload README.md

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README.md

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+# darling-python_modules
+
+## Upstream URL
+
+https://github.com/apple-oss-distributions/python_modules/tree/python_modules-61.140.1
+
+## Updating Source
+
+When updating the source code, make sure to refer to the [`Updating Sources`](https://docs.darlinghq.org/contributing/updating-sources/index.html#updating-sources) section from the Darling Docs website. Additional details (if any) can be found in [`darling/notes/UPDATE_SOURCE.md`](darling/notes/UPDATE_SOURCE.md).