Link to Code of Conduct in the footer (#2313)

src/components/LayoutFooter/Footer.js

@@ -6,6 +6,7 @@
  */
 
 import Container from 'components/Container';
+import ExternalFooterLink from './ExternalFooterLink';
 import FooterLink from './FooterLink';
 import FooterNav from './FooterNav';
 import MetaTitle from 'templates/components/MetaTitle';
@@ -81,6 +82,10 @@ const Footer = ({layoutHasSidebar = false}: {layoutHasSidebar: boolean}) => (
           </FooterNav>
           <FooterNav layoutHasSidebar={layoutHasSidebar}>
             <MetaTitle onDark={true}>{navFooter.community.title}</MetaTitle>
+            <ExternalFooterLink
+              href={`https://github.com/facebook/react/blob/master/CODE_OF_CONDUCT.md`}>
+              Code of Conduct
+            </ExternalFooterLink>
             {sectionListCommunity.map(section => (
               <FooterLink
                 to={`/community/${section.items[0].id}.html`}