add a license notice

Updated the README to include the license from the original repository (hoilman/uint256).
gnoswap-labs · Mar 11, 2024 · e941cb9 · e941cb9
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-# int256
-int256 without bigint
+# uint256
+
+hoilman's uint256 for gno.
+
+original code from: https://pkg.go.dev/github.com/holiman/uint256
+
+_**All code in this repository is subject to the license of the original repository**_