Update README.md

README.md

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 license: mit
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+---
+# Munich Urban Graph Network — Chain-of-Thoughts Dataset
+
+A high-fidelity, explainable dataset for urban graph reasoning and generative urban analytics in Munich.  
+Each entry represents a unique *chain-of-thought* (CoT) narrative, blending urban mobility, ecological perspective, zoning/policy context, and graph-theoretic features.
+
+---
+
+## 📂 Dataset Overview
+
+- **Format:** JSONL (`cots_50k.jsonl`)
+- **Total entries:** 50,000+
+- **Each entry contains:**
+  - **id**: Unique identifier for the CoT entry
+  - **document**: Rich, human-readable narrative describing the path, its segments, the urban/ecological/policy context, and embedded graph statistics
+  - **metadata**:
+    - `type`: Always `"cot"` (for Chain-of-Thought)
+    - `source`: Source node (city feature or network node, as numeric string)
+    - `target`: Target node (city feature or network node, as numeric string)
+    - `path_length`: Integer, number of graph hops in the described path
+    - `tone`: Style of the narrative (e.g., `"metaphorical"`, `"analytical"`)
+    - `perspective`: Narrative angle (e.g., `"resident"`, `"policy"`, `"ecology"`)
+    - `keyword`: Thematic or analytical tag for the entry (e.g., `"urban heat"`, `"green corridor"`)
+
+---
+
+## 🧩 Example Entry
+
+```json
+{
+  "id": "cot_341_analytical_ecology_8a94565d",
+  "document": "Between nodes 2272920565 and 392938983, 117 consecutive segments offer an analyzable corridor for urban heat. It covers 18534.6 meters. Segments: ... Habitat fragmentation risk noted at node 2272920565; a loose structure (clustering: 0.00) allowing flexible reconfiguration. Local reachability of 20 hops informs species corridor planning. The target node plays a stronger mediator role in routing dynamics (betweenness 0.00).",
+  "metadata": {
+    "type": "cot",
+    "source": "2272920565",
+    "target": "392938983",
+    "path_length": 117,
+    "tone": "analytical",
+    "perspective": "ecology",
+    "keyword": "urban heat"
+  }
+}