Add docblocks for classes and interfaces in Ramsey\Uuid\Provider namespace

src/Provider/NodeProviderInterface.php

@@ -14,7 +14,16 @@
 
 namespace Ramsey\Uuid\Provider;
 
+/**
+ * NodeProviderInterface provides functionality to get the node ID (or host ID
+ * in the form of the system's MAC address) from a specific type of node provider
+ */
 interface NodeProviderInterface
 {
+    /**
+     * Returns the system node ID
+     *
+     * @return string System node ID as a hexadecimal string
+     */
     public function getNode();
 }