Update README with GitHub Actions CI/CD information

Added a GitHub Actions badge and description for automated resume preview generation.

Author: pialexandraa

README.md

@@ -9,6 +9,10 @@ I named this template Strata (the Latin plural of stratum, meaning "layers"). I
   <img src="General_view2.jpg" width="382" alt="Resume Page 2 Preview">
 </p>
 
+[![Latest resume preview](https://github.com/pialexandraa/strata-tech-resume/actions/workflows/compile_resume.yml/badge.svg)](https://github.com/pialexandraa/strata-tech-resume/actions/workflows/compile_resume.yml)
+ 
+> 🎀 I also added an automated preview for the resume - it is a GitHub Actions CI/CD pipeline that compiles the LaTeX source and generates fresh PNG previews on every push; it sits in the "assets" dir for now, since I am using the statically-generated images.
+
 ## Characteristics
 
 * **Single-file implementation:** It is entirely built in LaTeX, in one document, eliminating the hustle of juggling the complex branching logic of various files.