Re-added code to clean branch

content/_code-samples/build-a-wallet/desktop-js/view/1_renderer.js

@@ -0,0 +1,7 @@
+const ledgerIndexEl = document.getElementById('ledger-index')
+
+// Here we define the callback function that performs the content update
+// whenever 'update-ledger-index' is called by the main process
+window.electronAPI.onUpdateLedgerIndex((_event, value) => {
+    ledgerIndexEl.innerText = value
+})