feat(demo): add story 1 — Sorano: Rock and Time

plugins/admin/vendor/scssphp/source-span/src/SourceSpanWithContext.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace SourceSpan;
+
+/**
+ * An interface that describes a segment of source text with additional context.
+ */
+interface SourceSpanWithContext extends SourceSpan
+{
+    /**
+     * Text around the span, which includes the line containing this span.
+     */
+    public function getContext(): string;
+
+    public function subspan(int $start, ?int $end = null): SourceSpanWithContext;
+}