feat: add a LLM TCO calculator tool (#559)

Signed-off-by: vinhn <vinhn@nvidia.com>
Signed-off-by: Elias Bermudez <6505145+debermudez@users.noreply.github.com>
Co-authored-by: Anthony Casagrande <acasagrande@nvidia.com>
Co-authored-by: Elias Bermudez <6505145+debermudez@users.noreply.github.com>

Author: 3 people

notebooks/LLM_TCO_Calculator.xlsx

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+<!--
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+-->
+# AIPerf Utility Notebooks
+
+This folder contains the various utility notebooks for AIPerf.
+
+1. [TCO_calculator.ipynb](TCO_calculator.ipynb): This notebook allows user to benchmark a NIM LLM deployment, then export the data to the NIM total cost of ownership (TCO) calculator.