Update README with corrections and donation request

Added a section for data corrections and a donation link.

Author: ironprogrammer

README.md

@@ -2,7 +2,27 @@
 
 A mobile-first single-page app for tracking swim times against Oregon Swimming (OSI) motivational time standards.
 
-> Encounter an issue? Head over to the [Issues tab](https://github.com/ironprogrammer/swimcheck/issues) and let me know!
+## Did you find this app useful?
+
+Please consider helping me cover my kid's swim meet fees!
+
+<a href="https://www.buymeacoffee.com/ironprogrammer" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 60px !important;width: 217px !important;" ></a>
+
+## Data Corrections - 2024-2025 Time Standards
+
+The following corrections were applied to clearly inconsistent data\* in the source PDF from the OSI site:
+
+| Age/Gender | Event | Course | Standard | PDF Value | JSON Value | Status | Reason |
+|------------|-------|--------|----------|-----------|------------|--------|--------|
+| Girls 9 | 100 Breast | LCM | A | `1:96.99` | `1:56.99` | ✅ Corrected | Invalid format |
+| Girls 10 | 100 Fly | LCM | B+ | `125:79.19` | `1:54.19` | ✅ Corrected | OCR error |
+| Girls 13 | 200 Breast | SCM | B | ~`3:31.89`** | `2:51.89` | ⚠️ Error | B faster than A/B+ |
+
+\* *The OSI PDF may contain errors; and so can this app! Refer directly OSI for questions/corrections.*
+
+\** *This might be the expected value based on time progression for this event, but it's just a guess.*
+
+> 🪲 Encounter any other issues? Head over to the [Issues tab](https://github.com/ironprogrammer/swimcheck/issues) and let me know!
 
 ## Features