Add model card (README)

README.md

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+# PiLA: PPG-based Cardiac Disease Diagnosis Model
+
+## Overview
+
+This repository provides pretrained and finetuned model weights for PiLA, a deep learning framework for cardiac disease diagnosis from photoplethysmography (PPG) signals.
+
+The model supports multimodal physiological inputs, including:
+
+* PPG
+* VPG (velocity PPG)
+* APG (acceleration PPG)
+
+## Files
+
+* `pretrain_model.pth`: self-supervised pretrained weights
+* `model_best.pth`: finetuned model for downstream diagnosis
+
+## Code
+
+Source code is available at:
+https://github.com/EZAIJ/PiLA-PPG
+
+## Data
+
+Due to privacy and ethical constraints, the dataset is not publicly available.
+
+## Notes
+
+* The released weights do not contain any identifiable or participant-level data.
+* This model is provided for research use only.
+
+## Paper
+
+https://arxiv.org/abs/2602.04266