Add scaffolding + Two props update check

src/sections/SectionB/index.js

@@ -0,0 +1,23 @@
+import React, { Component } from 'react';
+
+import '../section.css';
+
+class SectionB extends Component {
+  render() {
+    return (
+      <div className="section" ref={this.props.forwardedRef}>
+        <div className="section-text">
+          This is section B
+        <br />
+          {
+            this.props.body
+          }
+        </div>
+      </div>
+    )
+  }
+};
+
+export default React.forwardRef((props, ref) => {
+  return <SectionB {...props} forwardedRef={ref} />;
+});