Created 教师版封面学情展现 (markdown)

+## 教师在课程封面展示学生成绩 
+
+获取各项练习成绩  
+`/report/group/{class_id}/lesson/{lesson_id} ` 
+
+返回值  
+    
+    {  
+      "词句练习" : [ {  
+        "user_id" : 9200,  
+        "user_name" : "吕寰",  
+        "score" : 100  
+      } ],  
+      "词义练习" : [ {  
+        "user_id" : 9200,  
+        "user_name" : "吕寰",  
+        "score" : 100  
+      } ],  
+      "拼写练习" : [ {  
+        "user_id" : 9200,  
+        "user_name" : "吕寰",  
+        "score" : 96  
+      } ],  
+      "听力测验" : [ {  
+        "user_id" : 7827,  
+        "user_name" : "지연",  
+        "score" : 67.0  
+      } ],  
+      "type" : [ "词句练习", "词义练习", "拼写练习", "听力测验" ]  
+    }  
+    
+_type字段返回该课学生完成的全部练习类型，其他字段返回各个练习学生的完成情况。_
+_该接口在课程封面页每隔十秒刷新一次来更新成绩展示。_
+
+
+### 获取本课讲授词句统计和口语练习成绩
+`/event/statistic/lesson?access_token={access_token}&groupId={class_id}&lesson={lesson_id}`
+    
+    {  
+      "record" : [ {  
+        "score" : 0,  
+        "standard" : 0,  
+        "user_id" : 7827,  
+        "user_name" : "지연"  
+      }, {  
+        "score" : 736,  
+        "standard" : 85,  
+        "user_id" : 9200,  
+        "user_name" : "吕寰"  
+      } ],  
+      "title" : {  
+        "record" : "口语练习",  
+        "learning" : "本课讲授词句"  
+      }  
+    }  
+    
+_title返回口语练习和本课讲授词句在展示时显示的名称，record返回口语练习的情况，learning返回本课讲授词句_
+_该接口每次在课程成绩展示页只请求一次。_
+
+各项练习成绩在展示时的颜色从静态资源中获取：config/statistics.json  
+    
+    {  
+        "练习": {  
+            "color": "#60B336",  
+            "template": "Study"  
+        },  
+        "词句练习": {  
+            "color": "#60B336",  
+            "template": "Study"  
+        },  
+        "词义练习": {  
+            "color": "#60B336",  
+            "template": "Study"  
+        },  
+        "拼写练习": {  
+            "color": "#60B336",  
+            "template": "Study"  
+        },  
+        "听力测验": {  
+            "color": "#F16CB6",  
+            "template": "Listen"  
+        },  
+        "考题实战": {  
+            "color": "#41BCEB",  
+            "template": "Exam"  
+        },  
+        "口语练习": {  
+            "color": "#FF9E41",  
+            "template": "Speech"  
+        },  
+        "本课讲授词句": {  
+            "color": "#919DFF",  
+            "template": "WordsRecord"  
+        }  
+    }   
+       
+_根据各项练习名来获取相应颜色，template字段在改资源更改时不会发生改变。_
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