Allow Setting Django Version in requirements.txt and Install During Backend Scaffold

[sir-temi]

Allow Setting Django Version in requirements.txt and Install During Backend Scaffold

Description

Currently, the scaffolded backend does not specify a Django version in the requirements.txt file or install Django during the scaffolding process. This feature would:

1. Add a specific Django version (e.g., >=4.0,<5.0) to the requirements.txt file.
2. Ensure Django is installed with other dependencies during the scaffolding process.

This change would provide a consistent development environment and simplify the setup process.