wordpress-block-pattern.php

<?php 

/*
Plugin Name: WPS Custom Block Patterns
Description: Adds a custom block pattern to the Gutenberg block editor.
Version: 1.0
Author: Chris Romero
Author URI: https://cromero.io
*/

function wps_block_patterns() {

  $template = '<!-- wp:columns -->
  <div class="wp-block-columns">
    <!-- wp:column -->
    <div class="wp-block-column">
      <!-- wp:paragraph -->
      <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
        tempor incididunt ut labore et dolore magna aliqua.
      </p>
      <!-- /wp:paragraph -->
  
      <!-- wp:buttons -->
      <div class="wp-block-buttons">
        <!-- wp:button -->
        <div class="wp-block-button">
          <a class="wp-block-button__link">Learn More</a>
        </div>
        <!-- /wp:button -->
      </div>
      <!-- /wp:buttons -->
    </div>
    <!-- /wp:column -->
  
    <!-- wp:column -->
    <div class="wp-block-column">
      <!-- wp:paragraph -->
      <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
        tempor incididunt ut labore et dolore magna aliqua.
      </p>
      <!-- /wp:paragraph -->
  
      <!-- wp:buttons -->
      <div class="wp-block-buttons">
        <!-- wp:button -->
        <div class="wp-block-button">
          <a class="wp-block-button__link">Learn More</a>
        </div>
        <!-- /wp:button -->
      </div>
      <!-- /wp:buttons -->
    </div>
    <!-- /wp:column -->
  
    <!-- wp:column -->
    <div class="wp-block-column">
      <!-- wp:paragraph -->
      <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
        tempor incididunt ut labore et dolore magna aliqua.
      </p>
      <!-- /wp:paragraph -->
  
      <!-- wp:buttons -->
      <div class="wp-block-buttons">
        <!-- wp:button -->
        <div class="wp-block-button">
          <a class="wp-block-button__link">Learn more</a>
        </div>
        <!-- /wp:button -->
      </div>
      <!-- /wp:buttons -->
    </div>
    <!-- /wp:column -->
  </div>
  <!-- /wp:columns -->';

  register_block_pattern(
      'wps-patterns/three-column-with-buttons',
      array(
          'title'       => __( 'Three column grid pattern', 'wps-patterns' ),
          'description' => _x( 'Three columns of text and buttons.', 'Block pattern description', 'wps-patterns' ),
          'content'     => $template
      )
  );

}    
add_action( 'init', 'wps_block_patterns' );

Just a super basic example of a Wordpress block pattern.