`bindings/python:` readme

bindings/README.md

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+# Cashu bindings
+
+- UniFFI (Kotlin (soon), Swift (soon), Python):
+    * [cashu-ffi](./cashu-ffi/): UniFFI bindings of the [cashu] crate
+    * [cashu-sdk-ffi](./cashu-sdk-ffi/): UniFFI bindings of the [cashu-sdk] crate
+
+[cashu]: ../crates/cashu/
+[cashu-sdk]: ../crates/cashu-sdk/