Create README.md - basic info + source repo divergence note

Author: softwareengineerprogrammer

README.md

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+# Geothermal UI
+
+Web UI for GEOPHIRES & HIP-RA, as referenced in https://github.com/NREL/GEOPHIRES-X?tab=readme-ov-file#web-interface.
+
+Available at https://scientificwebservices.com/tools/geophires/, also accessible via https://bit.ly/GEOPHIRES
+
+Note: as of 2024-05-09, the source deployed at https://scientificwebservices.com/tools/geophires/ has diverged from this repository.
+It is undecided whether this repository will be kept in sync in the long-term; in either case, this repository will remain available for reference and filing/tracking issues.