Added lazy-loaded singletons

Tests/Mocks/Provider.php

+<?php
+
+
+namespace calderawp\CalderaContainers\Tests\Mocks;
+
+
+use calderawp\CalderaContainers\Interfaces\ProvidesService;
+use calderawp\CalderaContainers\Interfaces\ServiceContainer;
+
+class SivanService implements ProvidesService
+{
+
+	/** @inheritdoc */
+	public function registerService(ServiceContainer $container)
+	{
+		$container->bind( $this->getAlias(), function (){
+			return (object) [
+				'Roy',
+				'Mike'
+			];
+		} );
+	}
+
+	/** @inheritdoc */
+	public function getAlias()
+	{
+		return 'SIVAN';
+	}
+}
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