created mapping functions in About's urls and views

joei_yucoco_music/About/urls.py

+from django.shortcuts import render
+
+from django.urls import path
+from .views import index
+urlpatterns = [
+path('', index, name='index'),
+]
+
+app_name = "About"

joei_yucoco_music/About/views.py

 from django.shortcuts import render
 
+from django.http import HttpResponse
+
+def index(request):
+    return HttpResponse('I like listening to Vocaloid')
+
 # Create your views here.

joei_yucoco_music/Homepage/urls.py

@@ -8,4 +8,3 @@ path('', index, name='index'),
 
 app_name = "Homepage"
 
-# Create your views here.