add README

Signed-off-by: Ignacio Hagopian <jsign.uy@gmail.com>

README.md

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+# Ethereum stealth addresses (ERC-5564) library
+This repository is a Zig implementation of the Ethereum stealth addresses ([ERC-5564](https://eips.ethereum.org/EIPS/eip-5564#specification)).
+
+The implementation has zero dependencies (i.e: only relies on Zig standard library).
+
+**Note: this library hasn't been audited, use it at your own risk.**
+
+## What are stealth addresses?
+> **Stealth addresses** are a way of protecting the **privacy of recipients** in cryptocurrency transactions.
+They allow a sender to **non-interactively** generate a new address for the recipient, making it look like as if the sender interacted with some random account.
+
+## Where I can find more resources about stealth addresses?
+- [ERC-5564](https://eips.ethereum.org/EIPS/eip-5564#specification) and [ERC-6538](https://eips.ethereum.org/EIPS/eip-6538).
+- [Stealth Addresses tutorial](https://nerolation.github.io/stealth-utils/) by Toni Wahrstätter.
+- [An incomplete guide to stealth addresses](https://vitalik.eth.limo/general/2023/01/20/stealth.html) by Vitalik.
+- Web-based [Stealth wallet](https://stealth-wallet.xyz/) by Toni Wahrstätter.
+
+## How can I use this library?
+You can use this library as a dependency in your Zig project by adding it as a dependency to your `build.zig.zon` file.
+
+See the [library tests](https://github.com/jsign/zig-stealth-addresses/blob/511fa7f14875675a8565ecf156d1125b6ca3dfd8/src/stealth_address.zig#L94-L147) for some examples of how to use the defined APIs.
+
+In the future, this repo might include a CLI tool to generate and interact with stealth addresses.
+
+## License
+MIT.