feat: Add <p> tag support.

[xiCO2k]

This PR adds the support for the <p> HTML tag.

Example:

render(<<<'HTML'
    <p>Termwind is such a great tool to style your PHP command-line apps. now we just added the <b>paragraph</b> tag support.</p>
HTML);

Output:

Termwind is such a great tool to style your PHP command-line apps. now we just added the paragraph tag support.

[nunomaduro]

There is some tests failing.

[xiCO2k]

Yep looks like a text string is consider a <p> tag with DOMDocument.

I will create an issue to fix that later.