Add dataset card with schema docs and synthetic disclaimer

README.md

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+---
+license: mit
+task_categories:
+  - tabular-classification
+  - tabular-regression
+language:
+  - en
+tags:
+  - building-energy
+  - benchmarking
+  - sustainability
+  - leed
+  - breeam
+  - synthetic
+pretty_name: Building Energy Benchmarking
+size_categories:
+  - n<1K
+---
+
+# Building Energy Benchmarking Dataset
+
+> ⚠️ **Synthetic Data Disclaimer**: This dataset contains **synthetically generated data** for demonstration and testing purposes. It does not represent real buildings or actual energy performance data.
+
+## Overview
+
+Portfolio-level building energy benchmarking data with energy intensity metrics, CO2 emissions, and sustainability ratings. Useful for comparing building performance across different types and locations.
+
+## Schema
+
+```json
+{
+  "pipeline": "sustainable_building_benchmarking",
+  "generated_at": "ISO 8601 timestamp",
+  "portfolio_summary": {
+    "total_buildings": 12,
+    "total_floor_area_m2": 45680,
+    "avg_energy_intensity_kwh_m2": 98.4,
+    "portfolio_co2_tons": 892.5,
+    "top_performer_pct": 25,
+    "needs_improvement_pct": 33
+  },
+  "benchmark_categories": {
+    "energy_intensity": {
+      "excellent": "< 70 kWh/m²",
+      "good": "70-90 kWh/m²",
+      "average": "90-110 kWh/m²",
+      "poor": "> 110 kWh/m²"
+    }
+  },
+  "buildings": [
+    {
+      "building_id": "BLD-001",
+      "name": "Main Office Tower",
+      "location": "Stockholm",
+      "floor_area_m2": 5200,
+      "building_type": "Office | Laboratory | Retail | Hotel | Residential",
+      "year_built": 2018,
+      "energy_intensity_kwh_m2": 72.5,
+      "co2_intensity_kg_m2": 16.2,
+      "energy_percentile": 15,
+      "rating": "Excellent | Good | Average | Poor",
+      "certifications": ["LEED Gold", "BREEAM Excellent"]
+    }
+  ]
+}
+```
+
+## Rating Categories
+
+| Rating | Energy Intensity | Description |
+|--------|-----------------|-------------|
+| Excellent | < 70 kWh/m² | Top 25% performers |
+| Good | 70-90 kWh/m² | Above average |
+| Average | 90-110 kWh/m² | Typical performance |
+| Poor | > 110 kWh/m² | Needs improvement |
+
+## Certifications
+
+- LEED (Leadership in Energy and Environmental Design)
+- BREEAM (Building Research Establishment Environmental Assessment Method)
+- Energy Star
+- Green Building Council certifications
+
+## Use Cases
+
+- Portfolio energy management dashboards
+- Building performance comparisons
+- Sustainability reporting
+- Energy efficiency prioritization
+
+## Update Schedule
+
+This dataset is automatically updated **daily at 00:00 UTC** via GitHub Actions.
+
+## Source
+
+Generated by the [Sustainable-Building-Energy-Benchmarking-Pipeline](https://github.com/shahabsalehi/Sustainable-Building-Energy-Benchmarking-Pipeline) project.
+
+## License
+
+MIT License