I know how to write WordPress plugins but I have no idea how we could create an option page for our plugin. I have read lot of tutorials but I still have no idea about creating option pages.

So just for learning, I want to create an Option Page with one input field "Favicon URL" which will update **FAVICON IMAGE URL** part in the below code:

```
add_action('admin_head', 'show_favicon');
function show_favicon() {
echo '<link href="FAVICON IMAGE URL" rel="icon" type="image/x-icon">';
}

```