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Co-authored-by: krishung5 <krish@nvidia.com>

Creates a README.md file for Connect.

The README contains and overview, examples w/ diagrams, and documents the important classes.

The README is not intended to be comprehensive.
Instead it's meant to be more of a "getting started" or "learn the basics".
More comprehensive information / documentation is available from the inline comments / documentation.

Additionally, updates the Multimodal Example:

Moves the remote and local prefill code from the generate method into remote_prefill and local_prefill respectively.
Code changes made.
Replaces reference to "agent" with "worker" for consistency reasons throughout the inline documentation.
Only comments updated. No code changes made.
The intention of this change is improve readability of the example code and to provide clearer examples to reference from within documentation.

DIS-101