Block Editor: Add the initial set of block patterns.

Included patterns:

text-two-columns
two-buttons
two-images
text-two-columns-with-images
text-three-columns-buttons
large-header
large-header-paragraph
three-buttons
quote
testimonials

Props mcsf, nrqsnchz.
See #50550.


git-svn-id: https://develop.svn.wordpress.org/trunk@48334 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/block-patterns/quote.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * Quote block pattern.
+ *
+ * @package WordPress
+ */
+
+return array(
+	'title'         => __( 'Quote' ),
+	'content'       => "<!-- wp:quote {\"className\":\"is-style-large\"} -->\n<blockquote class=\"wp-block-quote is-style-large\"><p>" . __( '"Sir Knight, if your worship be disposed to alight, you will fail of nothing here but of a bed as for all other accommodations, you may be supplied to your mind."' ) . '</p><cite>' . __( '— Don Quixote' ) . "</cite></blockquote>\n<!-- /wp:quote -->",
+	'viewportWidth' => 800,
+	'categories'    => array( 'text' ),
+);