Add readme-txt TR/README_DDC_CWICR_TABULAR_TR_ISTANBUL.txt

TR/README_DDC_CWICR_TABULAR_TR_ISTANBUL.txt

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+# OpenConstructionEstimate — Turkey / Istanbul
+
+**Construction Work Items, Components & Resources**
+
+---
+
+| Property | Value |
+|---|---|
+| Reference region | Turkey / Istanbul |
+| ISO country | TR |
+| Language | `tr` |
+| Currency | `TRY` (ISO 4217) |
+| Source track | `DE_BERLIN` (Germany / Berlin) |
+| Generated | 2026-04-30 |
+| Work items | 900,225 rows |
+| Unique resources | 6,671 |
+
+## Available Formats
+
+| Format | File |
+|---|---|
+| Parquet | `TR_ISTANBUL_workitems_costs_resources_DDC_CWICR.parquet` |
+| Excel (formatted) | `TR_ISTANBUL_workitems_costs_resources_DDC_CWICR_FORMATTED.xlsx` |
+| Excel (simple) | `TR_ISTANBUL_workitems_costs_resources_DDC_CWICR_SIMPLE.xlsx` |
+| Catalog CSV | `DDC_CWICR_TR_ISTANBUL_Catalog.csv` |
+| Catalog XLSX | `DDC_CWICR_TR_ISTANBUL_Catalog.xlsx` |
+| Qdrant snapshot | `TR_ISTANBUL_workitems_costs_resources_EMBEDDINGS_3072_DDC_CWICR.snapshot` |
+
+## How this track was built
+
+This track was generated from `DE_BERLIN` by
+`0_Workflow and Pipelines CWICR/python/11-country-track-builder/add_country_track.py`.
+
+- **Norms** (labour hours, machine hours, resource quantities) are
+  identical to the source track — Resource-Based Costing methodology
+  treats norms as country-agnostic physical first principles.
+- **Prices** are derived via the cascade
+  `type_factors → location_factor → optional national overrides`.
+  Type factors come from OECD wage indexes (labour), construction
+  PPP (material), and ECB FX (equipment). FX snapshot date is
+  recorded in the per-resource columns.
+- **Language** columns are translated where target language differs
+  from source. Existing tracks are used as parallel-text seeds.
+
+## Data Structure
+
+85+ columns organised into:
+
+- Classification hierarchy (10 cols)
+- Rate / work-item identifiers (11 cols)
+- Resource decomposition (7 cols)
+- Labour metrics (11 cols)
+- Machinery & equipment (12 cols)
+- Price aggregates (16 cols)
+- Mass / service / regional markers (~18 cols)
+
+See the repository-level [DATA_DICTIONARY.md](../DATA_DICTIONARY.md)
+for the complete column-by-column reference.
+
+## Qdrant collection
+
+Vector index built from concatenated localised text fields,
+encoded with OpenAI `text-embedding-3-large` (3072-dim, cosine).
+
+```bash
+qdrant-client snapshot upload \
+  --collection ddc_tr_istanbul \
+  --snapshot TR_ISTANBUL_workitems_costs_resources_EMBEDDINGS_3072_DDC_CWICR.snapshot
+```
+
+## Licence
+
+Same as the parent dataset: CC BY 4.0 for data, see
+[LICENSE-DATA.txt](../LICENSE-DATA.txt). Code: see
+[LICENSE-CODE.txt](../LICENSE-CODE.txt).