Add Contact and ORCID footer

Author: matthewsmawfield

README.md

@@ -222,3 +222,8 @@ These are working preprints shared in the spirit of open science—all manuscrip
 - NASA CDDIS for data distribution
 - International GNSS Service (IGS) and contributing station operators
 - Tomoji Takasu (RTKLIB)
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+**Contact:** matthewsmawfield@gmail.com  
+**ORCID:** [0009-0003-8219-3159](https://orcid.org/0009-0003-8219-3159)