Add demo app.

Author: Hamit Zor

.gitignore

@@ -1,4 +1,3 @@
 node_modules
 yarn.lock
 package-lock.json
-dist

demo-app.js

@@ -0,0 +1,12 @@
+const path = require('path');
+const express = require('express');
+const compression = require('compression');
+const fs = require('fs');
+const app = express();
+
+const indexHTML = fs.readFileSync(path.resolve(__dirname, 'index.html')).toString();
+
+app.use(compression());
+app.get('*', (_, res) => res.send(indexHTML));
+
+exports.app = app;