Update README.md

README.md

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-# arabic-geo
+# Arabic Geo | بيانات جغرافية عربية
 
-بيانات جغرافية للوطن العربي - Arab world geo datasets & API
+Arab world geo data: 20 countries with capitals, coordinates, population.
+
+```python
+from geo_data import ARAB_COUNTRIES, total_population
+print(f'{len(ARAB_COUNTRIES)} countries, {total_population():.1f}M people')
+```
+
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