Create basic block

[MAILPOET-1798]

assets/js/src/post_editor_block/blocks.jsx

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+import './form_block.jsx';

assets/js/src/post_editor_block/form_block.jsx

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+import React from 'react';
+
+const wp = window.wp;
+const { registerBlockType } = wp.blocks;
+
+registerBlockType('mailpoet/form-block', {
+  title: 'Example: Basic (esnext)',
+  icon: 'universal-access-alt',
+  category: 'widgets',
+  example: {},
+  edit() {
+    return (
+      <div className="mailpoet-block-div">Hello World, step 1 (from the editor).</div>
+    );
+  },
+  save() {
+    return null;
+  },
+});