add demo application (benchmark)

examples/demo/data.js

@@ -0,0 +1,22 @@
+export const messages = [];
+
+const authors = ["Aaron", "David", "Vincent"];
+const content = [
+  "Lorem ipsum dolor sit amet",
+  "Sed ut perspiciatis unde omnis iste natus error sit voluptatem",
+  "Excepteur sint occaecat cupidatat non proident"
+];
+
+function chooseRandomly(array) {
+  const index = Math.floor(Math.random() * array.length);
+  return array[index];
+}
+
+for (let i = 1; i < 6000; i++) {
+  messages.push({
+    id: i,
+    author: chooseRandomly(authors),
+    msg: `${i}: ${chooseRandomly(content)}`,
+    likes: 0
+  });
+}