Add note about equivalent Solidity call

diff --git a/README.md b/README.md
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@@ -1,3 +1,5 @@
 # ERC-165 Calculator
 
 Minimal web app to calculate [ERC-165](https://eips.ethereum.org/EIPS/eip-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.