Add license

LICENSE

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+[PRIMARY MODEL LICENSE]
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+Use of this model is governed by the OpenMDWv1.1 License.
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+----------------------------------------------------------------------
+Files under different licenses
+----------------------------------------------------------------------
+
+The files `configuration_nemotron_h.py` and `modeling_nemotron_h.py` are licensed separately under the Apache License 2.0.
+A copy of the Apache-2.0 license is included below for convenience.
+The Apache-2.0 license applies ONLY to `configuration_nemotron_h.py` and `modeling_nemotron_h.py` and not to the rest of
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+
+----------------------------------------------------------------------
+Apache License 2.0 (applies only to `configuration_nemotron_h.py` and `modeling_nemotron_h.py`)
+----------------------------------------------------------------------
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