Create 2-3 simple use cases

[JulieWinchester]

We should create 2-3 use cases that we expect this plugin to be used for. Here's a possible use case to start with:

Use case:

• I am a content creator and I want to produce a simple 3D IIIF scene manifest document describing 4 3D models in context with a camera.
• I am not a 3D specialist.
• I do not have a IIIF manifest document to start with.
• I have 4 model GLTF assets of objects
• I want to position my objects relative to each other.
• I want to scale my objects relative to each other.
• I want to customize camera position relative to my objects.
• I want the produced scene to look the same in Blender and in my downstream IIIF viewer.

[JulieWinchester]

A second use case, somewhat similar to the first one.

Use case:

• I am a content creator and I want to modify an existing IIIF 3D scene to move objects and alter lighting.
• I am not a 3D specialist.
• I do have a pre-existing IIIF manifest to start with..
• From an imported scene, I want to re-position objects relative to each other.
• From an imported scene, I want to modify existing lights and add new lighting.
• I want the produced scene to look the same in Blender and in my downstream IIIF viewer.

[JulieWinchester]

A third use case for more technical users:

Use case:

• I am a 3D specialist and/or developer who wants to use Blender interactively as part of a suite of multiple tools to add 3D annotations to an existing IIIF 3D scene.
• I do have a pre-existing IIIF manifest to start with, and I want to import it into Blender.
• I will not use Blender to export a scene manifest at the end.
• I want to use Blender to verify exact positions, scales, and rotations of objects in the scene.
• I want to use Blender to "pick points" from the scene interactively. I will later use these picked coordinate points to apply annotations in non-Blender software (whether by modifying scene manifest JSON directly or using a secondary tool to apply annotations).
• I am familiar with the differences across 3D frameworks and applications.
• I want my imported Scene to conform to the actual IIIF axes - i.e., I want my objects in Blender to exist in "Y-up" configuration.