Ch02: Code Hello World web page content.

A website is two things: content, and a route to that content. A view in
Django defines the content.

helloworld/views.py

@@ -1,3 +1,5 @@
-from django.shortcuts import render
+from django.http import HttpResponse
 
-# Create your views here.
+
+def greeting(request):
+    return HttpResponse('Hello World!')