Add template rendering to hello/views.py

hello/views.py

-from django.shortcuts import render
+from django.http import HttpResponse
+from django.template import loader
 
 
 def index(request):
-    return render(request, 'base.html')
+    template = loader.get_template('base.html')
+    context = {
+        'message': "Hello, and welcome to the Platform.sh world",
+    }
+    return HttpResponse(template.render(context, request))