Added basics of LCPLegend and more controls for blocks. Added boilerplate for lcp/line-graph

blocks/line-graph/build/index.asset.php

@@ -0,0 +1 @@
+<?php return array('dependencies' => array('react', 'react-dom', 'wp-block-editor', 'wp-blocks', 'wp-components', 'wp-element', 'wp-i18n'), 'version' => '7d02545764a85b66ef48');