Added mybatis plus base file

Pinnacle/src/main/java/com/cfive/pinnacle/mapper/AffairMapper.java

@@ -0,0 +1,18 @@
+package com.cfive.pinnacle.mapper;
+
+import com.cfive.pinnacle.entity.Affair;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * <p>
+ * 事务 Mapper 接口
+ * </p>
+ *
+ * @author FatttSnake
+ * @since 2023-04-30
+ */
+@Mapper
+public interface AffairMapper extends BaseMapper<Affair> {
+
+}