Update README with new sections

Added sections for who we are, news, research, and teaching.

Author: ecisneros8

README.md

@@ -1 +1,10 @@
-# cisneros.github.io
+# Who we are
+Some blurb about our research, UTSI/UTK etc.
+
+# News
+Esteban will be presenting work on compressible combustion at the upcoming International Symposum...
+
+# Research
+
+# Teaching
+Upcoming graduate course on Uncertainty Quantification (Fall 2026)