Create readme

Author: numtel

README.md

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+# verified-solidity-source
+
+NPM package to fetch the Solidity source for a contract deployed on any EVM chain
+
+Supports:
+
+* Sourcify
+* Etherscan
+
+## Installation
+
+```
+npm install verified-solidity-source
+```
+
+## Usage
+
+This package exports a single async function that accepts 2 parameters: contract address and chain id.
+
+The first matching result is returned.
+
+```js
+import verifiedSource from 'verified-solidity-source';
+
+
+const sources = await verifiedSource('0x8644C2B4293923BF60c909171F089f4c5F75474c', 11155111);
+// { '<filename>': { content: '<solidity source>' }
+```
+
+## See Also
+
+* [@nomicfoundation/hardhat-verify](https://www.npmjs.com/package/@nomicfoundation/hardhat-verify) to go the other way and submit sources to block exporers
+
+## License
+
+MIT