Update README.md to include support information for TroveLedger and add a new image file

README.md

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 pinned: false
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+**README** • [ A brief history](history.md) • [TroveLedger](/datasets/Traders-Lab/TroveLedger)
 # 📊 Traders-Lab — Accumulated Financial Time Series
 
 Traders-Lab publishes **public financial time series datasets** with a deliberate focus on **long-term accumulation**, **structural consistency**, and **historical depth**, rather than short-term freshness.
@@ -89,4 +91,15 @@ TroveLedger is a structured, continuously expanding collection of market indices
 
 Each market is added deliberately and preserved as part of an expanding historical record.
 
-Detailed market coverage, recent additions, and dataset-specific notes are documented in the TroveLedger dataset card.
+Detailed market coverage, recent additions, and dataset-specific notes are documented in the TroveLedger dataset card.  
+
+### 💰 Support the Treasury Expansion
+
+If you're training AI models or building quant pipelines with the TroveLedger dataset, consider supporting further global indices:
+
+[![Support on Buy Me a Coffee](https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png)](https://www.buymeacoffee.com/mathiasbacs)
+
+Thank you for helping grow the trove!  
+
+---
+**README** • [ A brief history](history.md) • [TroveLedger](/datasets/Traders-Lab/TroveLedger)