修改项目结构，还有些混乱。

solution/admin.py

@@ -0,0 +1,3 @@
+from django.contrib import admin
+
+# Register your models here.

solution/models.py

@@ -0,0 +1 @@
+# coding=utf-8

solution/tests.py

@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.

solution/views.py

@@ -0,0 +1,3 @@
+from django.shortcuts import render
+
+# Create your views here.