Add code repository mirrors

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 Minimal web app to calculate [ERC-165](https://ercs.ethereum.org/ERCS/erc-165) interface IDs from Solidity functions.
 
 Equivalent to calling [`type(I).interfaceId`](https://docs.soliditylang.org/en/latest/units-and-global-variables.html#type-information) in Solidity.
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+Code repository mirrors: [GitHub](https://github.com/ardislu/erc-165-calculator), [Codeberg](https://codeberg.org/ardislu/erc-165-calculator), [git.ardis.lu](https://git.ardis.lu/erc-165-calculator)