feat: add comment

__crypto/aes_gcm_crypto/src/main.rs

@@ -147,6 +147,7 @@ impl GCM {
     }
 }
 
+// https://developer.aliyun.com/article/952809
 fn main() {
     let key: [u8; 32] = hex!("0001020304050607080910111213141516171819202122232425262728293031");
     let p: Vec<u8> = "Hello world!".as_bytes().to_vec();