Add documentation for hierarchical mapping of districts, grama panchayats, and wards

Care/Organisation/districts_and_their_gramapanchayts_and_wards_kc.md

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+# Districts and Their Grama Panchayats and Wards
+
+> Hierarchical mapping of districts to their grama panchayats and wards
+
+## Purpose
+
+Provides a location hierarchy list of government organizations by mapping:
+- District -> Grama Panchayat -> Ward
+
+
+---
+
+## Query
+
+```sql
+SELECT
+		district.id AS district_id,
+		district.name AS district,
+		grama.id AS grama_panchayat_id,
+		grama.name AS grama_panchayat,
+		ward.id AS ward_id,
+		ward.name AS ward
+FROM emr_organization AS district
+JOIN emr_organization AS grama
+		ON grama.parent_cache @> ARRAY[district.id::integer]
+		AND grama.deleted = false
+		AND grama.org_type = 'govt'
+		AND grama.metadata->>'govt_org_type' = 'grama_panchayat'
+JOIN emr_organization AS ward
+		ON ward.parent_id = grama.id
+		AND ward.deleted = false
+		AND ward.org_type = 'govt'
+		AND ward.metadata->>'govt_org_type' = 'ward'
+WHERE district.deleted = false
+	AND district.org_type = 'govt'
+	AND district.level_cache = 1
+ORDER BY district.name, grama.name, ward.name;
+```
+
+## Notes
+
+- This query has no runtime parameters.
+- The district records are represented at `level_cache = 1`.
+- Filters only non-deleted government organizations (`org_type = 'govt'`).
+- Government subtype filtering is based on `metadata->>'govt_org_type'` values:
+	- `grama_panchayat`
+	- `ward`
+
+*Last updated: 2026-08-03*