up README

Author: thautwarm

README.md

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+## PureScript-Prelude For Python
+
+Following https://github.com/purescript/purescript-prelude , we provide
+corresponding Python FFI files.
+
+If the purescript library is not distributed with required Python FFI files,
+the PSPY compiler will then try to get them from the repo [PureScript Python FFI Index](https://github.com/purescript-python/purescript-python-ffi-index) by default.
+
+You can also make your own index repo to use another `Prelude` Python implementation, by following the structure of
+[PureScript Python FFI Index](https://github.com/purescript-python/purescript-python-ffi-index).