Move examples from Google OAuth articles & repos

[RadoRado]

Currently, the examples for those 2 articles:

• https://www.hacksoft.io/blog/google-oauth2-with-django-react-part-1
• https://www.hacksoft.io/blog/google-oauth2-with-django-react-part-2

Are located here: https://github.com/HackSoftware/Django-React-GoogleOauth2-Example

And the code is currently decaying.

It's a good idea to migrate the entire example here & write some tests & potentially update the articles.