Fix Citation & Add `.zenodo.json`

Hi @jennamk14

Has this paper been published in a journal or a conference workshop?
```
MMLA: Multi-Environment, Multi-Species, Low-Altitude Aerial Footage Dataset
```
I can find an index [here](https://research-information.bris.ac.uk/en/publications/mmla-multi-environment-multi-species-low-altitude-drone-dataset/fingerprints/)

Please update the publication info in the README Paper section, and the `citation.cff` from the arxiv preprint to the published journal.

---

Please also add a `.zenodo.json` file following the [Zenodo Metadata](https://imageomics.github.io/Imageomics-guide/wiki-guide/GitHub-Repo-Guide/#zenodo-metadata) Guide section.

Check the publication index linked in the issue, then update the README Paper section and citation.cff from the arXiv preprint to the published journal details. Review the linked Zenodo Metadata Guide and add .zenodo.json with the repository metadata it requires. Done means both citation locations match the published work and the Zenodo metadata file follows the guide.

Written by the indexing model from the issue text.