Update README with code consistency notes

Added important note about code differences from tutorial.

Author: lpozo

gemini-cli-vs-claude-code/README.md

@@ -1,3 +1,13 @@
 # Gemini CLI vs Claude Code: Which to Choose for Python Tasks
 
 This folder provides the code examples for the Real Python tutorial [Gemini CLI vs Claude Code: Which to Choose for Python Tasks](https://realpython.com/gemini-cli-vs-claude-code/).
+
+## Important Note
+
+The code in this folder doesn't strictly match the code in the tutorial. The differences are the following:
+
+- Consistently use double quotes in string literals
+- Remove unused imports
+- Reformat lines longer than 79 characters
+
+These changes were required in order to meet the repository's quality rules.