Created 当前偏好下课程目录详细信息获取接口 (markdown)

+###接口地址
+
+>     /catalog
+
+###请求方式
+
+>     get请求
+
+###请求参数
+
+>     无参数
+
+###返回值
+######获取成功
+
+>     状态码:200
+
+```json
+[
+  {
+    "id": 100100101,
+    "name": "TEXTBOOK"
+  },
+  {
+    "id": 102,
+    "name": "PASSAGE"
+  },
+  {
+    "id": 105,
+    "name": "PHONICS"
+  },
+  {
+    "id": 103,
+    "name": "DIALOG"
+  },
+  {
+    "id": 104,
+    "name": "WORDS"
+  },
+  {
+    "id": 101,
+    "name": "QUIZ",
+    "quiz": 1
+  },
+  {
+    "id": 106,
+    "name": "OTHERS"
+  }
+]
+```
+######获取失败情况1
+
+>     状态码:404
+
+```json
+  {
+"failed":"该用户未设置偏好"
+}
+```
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