Update README with US tax payer note for 2025

Added important note regarding US tax changes for 2025.

Author: eprbell

README.md

@@ -17,6 +17,8 @@
 # RP2 v1.7.2
 Privacy-focused, free, powerful crypto tax calculator
 
+**IMPORTANT NOTE FOR US TAX PAYERS**: as of 2025 the US has switched from [Universal Application to Per-Wallet Application](https://github.com/eprbell/rp2/issues/135#issuecomment-2454959334). RP2 support for Per-Wallet applicaiton is ongoing but unfinished: see [issue 135 for details](https://github.com/eprbell/rp2/issues/135#issuecomment-2454959334). Do not use RP2 for 2025 US taxes until issue 135 is resolved.
+
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