Added link in README to Google Sheets version of tutorial

Author: maggie-vo

README.md

@@ -18,6 +18,8 @@ This course is structured to allow you many chances to practice writing and trou
 
 Note: This tutorial uses our smallest, fastest, and cheapest model, Claude 3 Haiku. Anthropic has [two other models](https://docs.anthropic.com/claude/docs/models-overview), Claude 3 Sonnet and Claude 3 Opus, which are more intelligent than Haiku, with Opus being the most intelligent.
 
+*This tutorial also exists on [Google Sheets using Anthropic's Claude for Sheets extension](https://docs.google.com/spreadsheets/d/19jzLgRruG9kjUQNKtCg1ZjdD6l6weA6qRXG5zLIAhC8/edit?usp=sharing). We recommend using that version as it is more user friendly.*
+
 When you are ready to begin, go to `01_Basic Prompt Structure` to proceed.
 
 ## Table of Contents