add nova

nova/src/Contracts/Cover.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Laravel\Nova\Contracts;
+
+interface Cover
+{
+    /**
+     * Resolve the thumbnail URL for the field.
+     *
+     * @return string|null
+     */
+    public function resolveThumbnailUrl();
+
+    /**
+     * Determine whether the field should have rounded corners.
+     *
+     * @return bool
+     */
+    public function isRounded();
+
+    /**
+     * Determine whether the field should have squared corners.
+     *
+     * @return bool
+     */
+    public function isSquared();
+}