Add Soroban footprint comparison example

README.md

@@ -119,6 +119,7 @@ The repository currently includes the following runnable examples:
 99. **`71-soroban-storage-update`**: Demonstrating the complete lifecycle of a Soroban storage update — reading initial state, simulating and submitting the modifying transaction, polling for confirmation, and verifying the updated value.
 100. **`100-authorization-entry-inspection`**: Decoding a `SorobanAuthorizationEntry` — distinguishing source-account from address credentials, walking the invocation tree including sub-invocations, decoding arguments, and reading the nonce and signature expiration ledger.
 101. **`101-simulation-result-analysis`**: Interpreting every part of a `simulateTransaction` response — classifying success, error and restore-required outcomes, reading the resource budget and ledger footprint, decoding the return value, and decoding diagnostic events.
+181. **`181-soroban-footprint-comparison`**: Comparing Soroban ledger footprints across multiple invocation variants, distinguishing read-only from read-write entries, spotting shared and divergent keys, flagging access-mode changes, and identifying the invocation with the smaller footprint.
 102. **`102-contract-storage-inspection`**: Probing contract storage keys across persistent and temporary durability, displaying raw `ScVal` XDR alongside decoded values, and handling missing keys and decoding failures without aborting the sweep.
 103. **`103-storage-ttl-management`**: Reading a storage entry's `liveUntilLedgerSeq`, classifying how much life it has left, and building, simulating and submitting an `ExtendFootprintTTL` transaction — plus when to restore an archived entry instead.
 23. **`23-manage-data-entries`**: Creating, updating, querying, and removing account data entries with `manageData`.