Add playground preview content.

Author: joedolson

src/ableplayer.php

@@ -667,3 +667,25 @@ function ableplayer_is_true( $condition ) {
 		return false;
 	}
 }
+
+
+add_action( 'admin_notices', 'able_status_notice', 10 );
+/**
+ * Display notice in Playground for demo purposes.
+ */
+function able_status_notice() {
+	// Only shown when in the Playground preview.
+	if ( 'true' === get_option( 'able_show_playground_intro', '' ) ) {
+		$settings_url = admin_url( 'options-general.php?page=ableplayer' );
+		echo '<div class="notice notice-info">';
+		echo '<h3>' . __( 'Thanks for trying out Able Player!', 'ableplayer' ) . '</h3>';
+		echo '<p>' . __( "Let me give you a few quick things to try out while you're here:", 'ableplayer' ) . '</p>';
+		echo '<ol>';
+		echo '<li>' . __( 'Create a new post and add media to experiment with Able Player.', 'ableplayer' ) . '</li>';
+		echo '<li>' . sprintf( __( 'Visit the <a href="%s">Able Player settings page</a> and explore options.', 'ableplayer' ), esc_url( $settings_url ) ) . '</li>';
+		echo '</ol>';
+		// translators: link to plugin documentation.
+		echo '<p>' . sprintf( __( 'To learn more, check out the <a href="%s">player documentation</a>.', 'ableplayer' ), 'https://ableplayer.github.io/ableplayer/' ) . '</p>';
+		echo '</div>';
+	}
+}