Update instructions

.github/copilot-instructions.md

@@ -3,8 +3,11 @@ MemoryGame is a Blazor WebAssembly application for people with dementia
 
 Always reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.
 
-Use dotnet version 10
-Always build and run test
+## General rules
+
+- Use dotnet version 10
+- Always build and run test
+- Update README.md automatically if a code change need to be addressed
 
 ## C# Coding Standards
 - Should use params collections (e.g., ```csharp