update examples on homepage

src/tests/site/code/futures.dart

Index: src/tests/site/code/futures.dart
diff --git a/src/tests/site/code/futures.dart b/src/tests/site/code/futures.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5e0328787d414e3575b81c8cf2887f0d862e259b
--- /dev/null
+++ b/src/tests/site/code/futures.dart
@@ -0,0 +1,18 @@
+import 'dart:io';
+import 'dart:async';
+
+void printDailyNewsDigest() {
+  File file = new File('dailyNewsDigest.txt');
+  file.readAsString()   // readAsString() returns a Future.
+      .then((content) { // Specifies what to do if the Future completes successfully.
+        print(content); // Executes when the file has been successfully read.
+      })
+      .catchError((error) { // Specifies error handling code.
+        print("Sorry, no news today. Here's why:\n");
+        print('$error');
+      });
+}
+
+main() {
+  printDailyNewsDigest();
+}