Initial commit

src/components/UpgradeIcon/UpgradeIcon.css

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+.UpgradeIcon {
+  display: block;
+  margin: 0;
+  padding: 0;
+  width: 20px;
+  height: 20px;
+  border: 0;
+  box-sizing: border-box;
+  cursor: pointer;
+}
+
+div.UpgradeIcon {
+  cursor: default;
+}

src/components/UpgradeIcon/UpgradeIcon.js

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+import React from 'react';
+import CSSModules from 'react-css-modules';
+import styles from './UpgradeIcon.css';
+import availableImage from '../../assets/images/upgrade_available.png';
+
+export default CSSModules((props) => {
+  return props.available ?
+    <img alt='' styleName='UpgradeIcon' src={availableImage} onClick={props.clicked}/> :
+    <div styleName='UpgradeIcon'/> ;
+}, styles, {allowMultiple: true});