Mention CODING_STANDARDS in CONTRIBUTING (NVIDIA#1320)

* docs: linking code standards directory in CONTRIBUTING

Signed-off-by: Kelvin Lee <kinlongkelvi@nvidia.com>

* docs: bump license header year

---------

Signed-off-by: Kelvin Lee <kinlongkelvi@nvidia.com>

Author: laserkelvin

CONTRIBUTING.md

@@ -25,6 +25,13 @@ we will get back to you.
 
 ## Contribute to PhysicsNeMo-Core
 
+### Coding Style
+
+Beyond using standard tools for formatting and linting, we document and enforce
+guidelines for how the PhysicsNeMo codebase is organized. Please consult the
+`CODING_STANDARDS` directory for details on how and where to contribute code,
+including a "ruleset" for developing models.
+
 ### Pull Requests
 
 Developer workflow for code contributions is as follows:
@@ -53,7 +60,7 @@ should be linked on Github.
 All source code files should start with this paragraph:
 
 ```bash
-# SPDX-FileCopyrightText: Copyright (c) 2023 - 2024 NVIDIA CORPORATION & AFFILIATES.
+# SPDX-FileCopyrightText: Copyright (c) 2023 - 2025 NVIDIA CORPORATION & AFFILIATES.
 # SPDX-FileCopyrightText: All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #