Update README.md

Author: Nero978

README.md

@@ -4,6 +4,8 @@ This game was rewritten by Chris Liu using C++ for CPP class 2023, and is only u
 
 If there are any bugs with it, please give me feedback to help me finish this homework. Thank you!
 
+The idea of the game and some image materials come from Microsoft Edge. Please do not use them for business without Microsoft's permission.
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 Download Release Version: https://cdn.rxgzs.cn/Surf/