Created index.html using Django templates

I created index.html using Django templates. Changes made:
1. Created templates directory inside the TrackCat project
2. Created a basic index.html inside templates directory
3. Defined location of templates in settings.py ( look absolute path for TEMPLATE_DIRS inside http://www.djangobook.com/en/2.0/chapter04.html)
4. Used function render_to_response instead of Http_response in views.py 

Thanks for reviewing!
it's good form to keep imports at the start of the page :wink: