OpenZeppelin/canton-contracts: examples/token/token-cip112-custom/README.md

# Custom token example A compliance-grade token that owns every template it deploys (`MyHolding`, `MyTransferInstruction`, `MyAllocation`, `MyRules`) and reuses the OpenZeppelin CIP-0112 workflows unchanged. It depends on `openzeppelin-token-cip112-types-v1` and `openzeppelin-token-cip112-utils` onl