add Footer-SubscribeForm

[Sava12012]

<footer>
  <div class="container">
    <h3>Subscribe to our Newsletter</h3>
    <form class="subscribe-form" action="#" method="post">
      <input type="email" name="email" placeholder="Enter your email" required>
      <button type="submit">Subscribe</button>
    </form>
  </div>
</footer>