Update README.md

README.md

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----
-license: cc-by-4.0
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+---
+license: cc-by-4.0
+task_categories:
+- tabular-classification
+- time-series-forecasting
+tags:
+- epidemiology
+- demographics
+- population
+- world-bank
+---
+
+# World Population Data (World Bank)
+
+This dataset contains annual population estimates provided by the [World Bank](https://data.worldbank.org/indicator/SP.POP.TOTL). It is used within the **EPI-Eval** framework to provide denominators for disease incidence and prevalence calculations.
+
+### Coverage
+- **Time:** 1960 → 2023 (or latest available)
+- **Geography levels:** National, Regional, and Global
+- **Source:** World Bank Open Data (Indicator: SP.POP.TOTL)
+
+### Columns
+| Column | Unit | Description |
+| --- | --- | --- |
+| **location_id** | String | ISO 3166-1 alpha-3 country code (e.g., USA, AFG). |
+| **year** | YYYY | The year of the population estimate. |
+| **value** | count | Total population count. |
+
+### Access & Attribution
+- **Availability:** Open Access
+- **License:** [CC-BY 4.0](https://creativecommons.org/licenses/by/4.0/)
+- **Citation:** *World Bank Open Data, Population, total. https://data.worldbank.org/indicator/SP.POP.TOTL*
+- **Tier:** 1
+
+---
+*Schema version 0.1 · source_id: world-bank-pop*