Add StudyTypeTeller

## Adding a Dataset
- **Name:** StudyTypeTeller
- **Description:** A manually annotated corpus of PubMed titles and abstracts labeled with biomedical study types to support automated classification in systematic review workflows.
- **Task:** Text classification (multi-class, study type classification)
- **Paper:** https://doi.org/10.1017/rsm.2025.10031
- **Data:** https://huggingface.co/datasets/bigbio/neurotrial_ner
- **License:** Public (please confirm exact license if required)
- **Motivation:** This dataset enables the development and evaluation of models for automatic study type classification, which can help reduce the workload in abstract screening for systematic reviews and improve the efficiency of evidence synthesis.