Add simple templating for html

Add templating to HTML return

```
<html>
<head>
<title>Hello Process %d !</title>
</head>
<body>
<h1>%s Request</h1>
<p> Host: %s
<p> User-Agent: %s
<p> Looking for: <b>%s</b>
<p>Answered by PID: %d
</body>
</html>
```

With the above HTML, the function should be able to pass in the correct variables from the top down. The output page will be filled in and returned.