Update README.md

README.md

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----
-license: gpl
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+---
+license: gpl
+language:
+- en
+tags:
+- import
+- africa
+- economy
+size_categories:
+- 1K<n<10K
+---
+# Africa: Lead time to import, median case (days)
+
+## Dataset summary
+- This dataset provides values for "Lead time to import, median case (days)" across African countries, standardized and made ML-ready.
+- Geographic scope: 54 African countries.
+- Temporal coverage: 1960–2024 (annual).
+- Units: As defined by the World Bank indicator.
+
+## Source & licensing
+- Source: World Bank – World Development Indicators (WDI), Indicator code: `LP.IMP.DURS.MD`.
+- License: World Bank Open Data terms. Users are responsible for compliance with the World Bank Data Terms of Use.
+
+## Intended uses
+- Cross-country analyses and visualization related to trade, logistics, and economic indicators.
+- As an input feature for ML models in trade, development, and economic domains.
+- Educational and exploratory data analysis.
+
+Use with caution for early years and countries with imputed values.
+
+## Processing summary
+Missing values in the pivot were handled via:
+- Linear interpolation along years (`limit_direction="both"`)
+- Forward fill
+- Backward fill
+Countries with no observations across all years remain entirely NaN.
+
+## Coverage and data quality notes
+- Earliest non-missing observation (across all countries): 2007.
+- Countries with no observations (all NaN in pivot):
+  - Botswana, Cabo Verde, Comoros, Equatorial Guinea, Eswatini, Guinea-Bissau, Lesotho, Sao Tome and Principe, Seychelles, Somalia, South Sudan.