add member

sigs/security/sig_members.yaml

@@ -13,6 +13,11 @@ Members:
   gitee_home: https://gitee.com/emmmmtang
   email: 1203355251@qq.com
 
+- name: Yuki
+  gitee_home: https://gitee.com/ItsukiFujii
+  email: 1216617903@qq.com
+  interest: recommendation system, graph neural networks and federated learning
+
 Reviewers:
 - name: Mr. Jin
   gitee_home: https://gitee.com/jxlang910