[docs add] BigDecimal解决浮点数运算精度丢失问题

Author: Snailclimb

docs/.vuepress/config.js

@@ -157,7 +157,10 @@ module.exports = config({
               "java基础知识总结",
               {
                 title: "重要知识点",
-                children: ["why-there-only-value-passing-in-java", "反射机制详解", "代理模式详解", "io模型详解"],
+                children: [
+                  "why-there-only-value-passing-in-java", "反射机制详解", "代理模式详解", "io模型详解",
+                  "bigdecimal"
+                ],
               },],
           },
           {