Added synthetic data schemas, sample datasets, preprocessing notebook…

[jacksonwilliamyu]

… and readme

Description

• Defined data schemas for vitals, wearable inputs, and optional emotion data (facial/voice).
• Collected annotated vitals time-series and simulated wearable datasets.
• Designed preprocessing pipelines for time-series cleaning and baseline normalization.
• Established privacy and security guidelines for wearable and sensitive emotion data.
• Developed a data acquisition plan including integration of future wearable data sources.
• Implemented quality assurance for time-series integrity and labeling accuracy.

Todos

• Synthetic datasets created
• Schema CSVs defined and validated
• Preprocessing notebook added
• Documentation (README) included
• Request review from >= 2 devs (lead + Jiya)

How to test

1. Review schema files in AI Guardian/DataSchemas_WJ/raw_data/.
2. Open preprocessing.ipynb and run cleaning/validation steps.
3. Confirm that processed outputs are generated in processed_data/:
   - emotions_clean.csv
   - vitals_clean.csv
   - wearables_clean.csv
   - merged_timeseries.csv