Adding description for Nemo Retriever's Agentic Retriever Pipeline and its submission for Vidore V3 pipeline LB

[gabrielspmoreira]

Description

Simple PR with a placeholder markdown document about Nemo agentic pipeline for Vidore V3

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• If adjusting docker-compose.yaml environment variables have you ensured those are mimicked in the Helm values.yaml file.

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