Added details to readme

Author: shimwell

README.md

@@ -1,10 +1,11 @@
-[Demo](https://openmc-data-storage.github.io/nuclide_cross_section_plotter.rs/index.html)
+This repository hosts the source code for the Nuclide Cross Section Plotter hosted on [xsplot.com](https://xsplot.com)
 
-You can install the dependencies and build the web app.
+[Direct link to the webapp](https://openmc-data-storage.github.io/nuclide_cross_section_plotter.rs/index.html)
 
-Instructions on Ubuntu 22.04
+The web app allows users to search a database of neutron cross sections, filter the results, plot graphs and download the data.
 
-```
+You can install the dependencies and build the web app locally with these instructions that have been tested on Ubuntu 22.04
+```bash
 sudo apt-get update
 sudo apt-get install curl
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh