Add new file

+# 获取单个skn的变价记录
+
+> 接口名： `/product/queryProductPriceListBySkn`     例子（http://localhost:8080/product/queryProductPriceListBySkn）
+
+### 方法
+
+> POST JSONRAW
+
+### 入参
+
+-------------------------
+|属性名称|类型|例子|说明|是否必填|长度限制|
+|--------|----|----|---|----|--------|
+|param|number|50002403|商品SKN|Y|1024|
+
+
+
+
+
+### 对应SQL的操作库表
+
+```xml
+  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
+    delete from product_pool
+    where id = #{id,jdbcType=INTEGER}
+  </delete>
+```
+
+### 错误编码
+
+-------------------------
+|错误码code|消息|说明|
+|--------|----|----|
+|200| 查询成功！| |
+|401| 参数错误！| |
+|500| 查询失败！| |
+
+### 返回
+
+``` json
+{
+  "alg": "SALT_MD5",
+  "code": 200,
+  "data":{ 
+       "additionInfo": {
+          "productSkn": 1111111,                  // SKN
+          "goodsName": "123",                  // 商品名称
+          "brandName": "adidas",                  // 品牌名称
+          "maxSortName": "上衣",                  // 分类
+          "midleSortName": "衬衫",                  // 分类
+          "smallSortName": "衬衫",                  // 分类
+        }, 
+    
+      "list": [
+          {
+            "retailPrice": 175,
+            "salesPrice": 22,
+            "founderName": "变价人",
+            "createTime": "2016-06-00 12:12:12",
+            "effectiveTime": "2016-06-01",
+          },
+          {
+            "retailPrice": 175,
+            "salesPrice": 22,
+            "founderName": "变价人",
+            "createTime": "2016-06-00 12:12:12",
+            "effectiveTime": "2016-06-01",
+          }
+        ]
+      },
+  "md5": "64cdf0d30ba9174ddce76ecf71a91ad8",
+  "message": "queryProductPriceListBySkn success."
+}
+
+```
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