Add citation section to README

[Angelina-C]

Add a citation section at the end of the README and provide the citation to the paper. Below is an example how to write the section

Citation
If you use this work, the Puma framework, or refer to the approach described in this repository, please cite our paper:

@article{CLAIJSWART2025301985,
  title = {Automatically generating digital forensic reference data triggered by mobile application updates},
  journal = {Forensic Science International: Digital Investigation},
  volume = {54},
  pages = {301985},
  year = {2025},
  issn = {2666-2817},
  doi = {https://doi.org/10.1016/j.fsidi.2025.301985},
  url = {https://www.sciencedirect.com/science/article/pii/S2666281725001258},
  author = {Angelina A. Claij-Swart and Erik Oudsen and Bouke Timbermont and Christopher Hargreaves and Lena L. Voigt},
  keywords = {Digital forensics, Datasets, Reference data, Data synthesis, Tool validation, Tool testing, Mobile forensics},
  abstract = {Mobile applications are subject to frequent updates, which poses a challenge for validating digital forensic tools. This paper presents an approach to automate the generation of reference data on an ongoing basis, and how this can be integrated into the overall validation process of a digital forensic analysis platform. Specifically, it describes the architecture of the mobile data synthesis framework Puma, shares its capabilities via an open-source project, and shows how it can be used in a tool testing workflow triggered by application updates. The value of this approach is demonstrated with three example use cases, documenting the use of the approach over six months and reporting insights and experiences gained from this integration. Finally, this work highlights additional contributions the proposed approach and tooling could make to the digital forensics community.}
}

Plain Text Citation:
Claij-Swart, A. A., Oudsen, E., Timbermont, B., Hargreaves, C., & Voigt, L. L. (2025). Automatically generating digital forensic reference data triggered by mobile application updates. Forensic Science International: Digital Investigation, 54(Supplement), 301985. https://doi.org/10.1016/j.fsidi.2025.301985