[documentation] missing README for model-config-datasource plugin

[ronenkat]

What happened:

The model-config-datasource datalayer plugin (pkg/framework/plugins/datalayer/modelconfigcollector/) has no README.md. There is no documentation describing what the plugin does, how to configure it, the expected config file format, or its runtime behavior.

What you expected to happen:

A README.md exists in the plugin directory that documents:

• Purpose and behavioral intent of the plugin
• Config file format (modelsPath JSON schema)
• Plugin configuration fields and an example snippet
• Inputs consumed and outputs produced

How to reproduce it (as minimally and precisely as possible):

1. Navigate to pkg/framework/plugins/datalayer/modelconfigcollector/.
2. Observe that only plugin.go and plugin_test.go are present — no README.md.

Anything else we need to know?:

Other plugins in the repository include a README.md following a consistent format. The model-config-datasource plugin should follow the same convention.

Environment:

• Kubernetes version (use kubectl version): N/A
• llm-d-scheduler version (use git describe --tags --dirty --always if you built from source, or specify the tag if you used a tagged version or image): N/A
• Cloud provider or hardware configuration: N/A
• Install tools: N/A
• Others: N/A