Revert "【DEL】删除示例文件"

This reverts commit dd33b3932643ff46e315d43245307deb2b1d7afe.

railway-admin/src/main/java/com/railway/web/controller/business/catenary/DemoController.java

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+package com.railway.web.controller.business.catenary;
+
+public class DemoController {
+
+}

railway-admin/src/main/java/com/railway/web/controller/business/safetool/DemoController.java

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+package com.railway.web.controller.business.safetool;
+
+public class DemoController {
+
+}

railway-business/src/main/java/com/railway/business/catenary/domain/Demo.java

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+package com.railway.business.catenary.domain;
+
+public class Demo {
+
+}

railway-business/src/main/java/com/railway/business/catenary/mapper/DemoMapper.java

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+package com.railway.business.catenary.mapper;
+
+public class DemoMapper {
+
+}

railway-business/src/main/java/com/railway/business/catenary/service/DemoService.java

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+package com.railway.business.catenary.service;
+
+public class DemoService {
+
+}

railway-business/src/main/java/com/railway/business/catenary/service/impl/DemoServiceImpl.java

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+package com.railway.business.catenary.service.impl;
+
+public class DemoServiceImpl {
+
+}

railway-business/src/main/java/com/railway/business/safetool/domain/Demo.java

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+package com.railway.business.safetool.domain;
+
+public class Demo {
+
+}

railway-business/src/main/java/com/railway/business/safetool/mapper/DemoMapper.java

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+package com.railway.business.safetool.mapper;
+
+public class DemoMapper {
+
+}

railway-business/src/main/java/com/railway/business/safetool/service/DemoService.java

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+package com.railway.business.safetool.service;
+
+public class DemoService {
+
+}

railway-business/src/main/java/com/railway/business/safetool/service/impl/DemoServiceImpl.java

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+package com.railway.business.safetool.service.impl;
+
+public class DemoServiceImpl {
+
+}