Add third_party_licenses.txt

third_party_licenses.txt

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+This project uses the following third-party libraries:
+
+---
+
+GDCM (Grassroots DICOM)
+Website: https://github.com/malaterre/GDCM
+License: BSD-style license
+
+---
+
+VTK (The Visualization Toolkit)
+Website: https://vtk.org/
+License: BSD 3-Clause License
+
+---
+
+ITK (Insight Segmentation and Registration Toolkit)
+Website: https://itk.org/
+License: Apache License 2.0
+
+---
+
+These libraries are used as external dependencies and are not redistributed with this source code.
+Please refer to their respective websites for full license texts.