add README

zhangchiqing · Jul 11, 2020 · 377572d · 377572d
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+This is a simplified implementation of Ethereum's modified Merkle Patricia tree based on [Ethereum's yellow paper](https://ethereum.github.io/yellowpaper/paper.pdf).
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+- This implementation is simple because it doesn't involve tree encoding/decoding, data persistent.
+- It's purely focus on the algorithm and data structure.
+- It's not made for production use, but just for learning purpose.