Add some README notes

Author: coatless

README.md

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-# convert-shiny-app-r-shinylive
+# Deploying an R Shinylive App via GitHub Pages through GitHub Actions
+
+This repository demonstrates how to deploy an R Shinylive app using GitHub Actions and GitHub Pages.
+
+The initial app source code is from a [StackOverflow Question](https://stackoverflow.com/questions/78153629/static-version-of-r-shiny-app-using-shinylive-package-failing-to-preload-package) by [Dasha Semochkina](https://stackoverflow.com/users/23593955/dasha-semochkina).
+
+## Setup
+
+... 
+