README: add 'Support the project' — star OpenConstructionERP on GitHub

README.md

@@ -247,6 +247,10 @@ The CWICR pipeline (parsers, normalisers, classifiers) is open-source. Each parq
 
 See the source repository for full pipeline scripts.
 
+## Support the project ⭐
+
+If this dataset is useful to you — or if you'd like to see more open construction databases like it — the most helpful thing you can do is **leave a star on the [OpenConstructionERP repository](https://github.com/datadrivenconstruction/OpenConstructionERP)**. Stars are how we gauge demand and prioritise the next country / language / source to publish. No account needed beyond GitHub, no signup, no money — just a one-click thank-you that directly steers what gets built next.
+
 ## License
 
 Released under **Apache-2.0** for the dataset structure, normalisation pipeline, and derived metadata. Underlying rate codes and prices are sourced from publicly available national catalogues — each catalogue's terms of use apply to commercial redistribution of raw numeric values.