Mention ContributorFooter in README

Author: briangershon

README.md

@@ -192,6 +192,10 @@ You can add a contributor as an author, reviewer of contributor. Author(s) wrote
 the content, Reviewer(s) edited the content, and Contributor(s) later made
 updates or fixed issues.
 
+```jsx
+import { ContributorFooter } from '../../../components/mdx/ContributorFooter'
+```
+
 ```jsx
 <ContributorFooter
   authors={['brianfive']}

pages/lessons/projects/4.mdx

@@ -6,7 +6,6 @@ icons: ['solidity', 'hardhat', 'openzeppelin']
 ---
 
 import { LessonHeader } from '../../../components/mdx/LessonHeader'
-import { ContributorFooter } from '../../../components/mdx/ContributorFooter'
 
 <LessonHeader
   title="Lesson 4: Testing your TierNFT"
@@ -893,6 +892,8 @@ With TDD:
 Go forth, test, and prosper knowing you have confidence in the code you're
 deploying into the world.
 
+import { ContributorFooter } from '../../../components/mdx/ContributorFooter'
+
 <ContributorFooter
   authors={['brianfive']}
   reviewers={['piablo', 'georgemac510']}