Update README.md

Author: simasaadi

README.md

@@ -64,7 +64,7 @@ Scripts are in `src/pipeline/` and can be executed end-to-end via:
 
 
 
-\## How to run (local)
+## How to run (local)
 
 ```bash
 python -m venv .venv
@@ -81,6 +81,10 @@ python -m pip install -r requirements.txt
 ./run_all.ps1   # Windows
 ./run_all.sh    # Mac/Linux
 
+Data sources
+
+Natural Earth (vector datasets). Raw files are downloaded during ingest and ignored by git; small samples are committed for fast demo loading.                                                                                            
+