AG-2653 Put React Hook example together, update docs

src-examples/simpleReduxHooksExample/gridDataActions.jsx

@@ -0,0 +1,14 @@
+export function updateRowData(rowData) {
+    return {
+        type: 'ROW_DATA_CHANGED',
+        rowData
+    }
+}
+
+export function setCurrency(currencySymbol, exchangeRate) {
+    return {
+        type: 'CURRENCY_CHANGED',
+        currencySymbol,
+        exchangeRate
+    }
+}