Re-level non-docs content to top of repo and rename content→docs

_code-samples/build-a-desktop-wallet/js/4-tx-history/view/preload.js

@@ -0,0 +1,19 @@
+const { contextBridge, ipcRenderer } = require('electron');
+
+contextBridge.exposeInMainWorld('electronAPI', {
+    onUpdateLedgerData: (callback) => {
+        ipcRenderer.on('update-ledger-data', callback)
+    },
+    onEnterAccountAddress: (address) => {
+        ipcRenderer.send('address-entered', address)
+    },
+    onUpdateAccountData: (callback) => {
+        ipcRenderer.on('update-account-data', callback)
+    },
+
+    // Step 4 code additions - start
+    onUpdateTransactionData: (callback) => {
+        ipcRenderer.on('update-transaction-data', callback)
+    }
+    // Step 4 code additions - end
+})