In order to add a tag cloud to a theme, you’ll need some HTML and CSS ability. Here’s some example HTML for adding a tag cloud:

{% if site.tags %}
<div class="tags">
{% for tag in site.tags %}
<a href="/tag/{{ tag.name }}">#{{ tag.name }}</a>
{% endfor %}
</div>
{% endif %}

You can style it however you like by adding some classes in between the