diff --git a/doc/wechat_group_1.jpeg b/doc/wechat_group_1.jpeg
new file mode 100644
index 0000000000000000000000000000000000000000..443a1549d5c79e86b26038d7eb2e704ed5f9213f
Binary files /dev/null and b/doc/wechat_group_1.jpeg differ