Document using Django's ORM in other Python projects

### Code of Conduct

- [x] I agree to follow Django's Code of Conduct

### Feature Description

There's a long standing desire to make the ORM easier to use outside of a regular Django project. (Script usage for example.) Django should explicitly support this use-case, and provide documentation to guide users.

### Problem

While it is possible to use the Django ORM without much of Django's other machinery already, there is still some minimal configuration with settings and calling `django.setup()`. The necessary configuration is difficult to discover, so many users find it difficult to get started or don't think it's possible.

### Request or proposal

request

### Additional Details

Extracting the ORM into a separate package is proposed in #6. This proposal is for an easier step that may satisfy the majority of use-cases. It will also provide a clearer backdrop for pursuing changes to make using the ORM in external projects easier.

### Implementation Suggestions

_No response_