模块初始化，占位

measurement/src/main/java/com/ruoyi/bill/controller/a1.java

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+package com.ruoyi.bill.controller;
+
+public class a1 {
+}

measurement/src/main/java/com/ruoyi/bill/domain/a1.java

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+package com.ruoyi.bill.domain;
+
+public class a1 {
+}

measurement/src/main/java/com/ruoyi/bill/mapper/a1.java

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+package com.ruoyi.bill.mapper;
+
+public class a1 {
+}

measurement/src/main/java/com/ruoyi/bill/service/a1.java

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+package com.ruoyi.bill.service;
+
+public class a1 {
+}