[SPONSOR] Add QR code for sponsor (#486)

* add wx/zfb * update fig
PKUFlyingPig · Aug 2, 2023 · ffeb410 · ffeb410
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diff --git a/docs/images/sponsor.png b/docs/images/sponsor.png
diff --git a/docs/index.md b/docs/index.md
@@ -88,3 +88,11 @@
 ## 关于交流群的建立
 
 方法参见仓库的 `README.md`。
+
+## 请作者喝杯下午茶
+
+本书的内容是完全开源免费的，如果你觉得该项目对你真的有帮助，可以给仓库点个 star 或者请作者喝一杯下午茶。
+
+<figure markdown>
+  ![Image title](./images/sponsor.png){ width="500" }
+</figure>