add info about installing spreadsheet program

setup.md

@@ -4,8 +4,26 @@ title: Setup
 permalink: /setup/
 ---
 
-This workshop is designed to be run on pre-imaged Amazon Web Services 
-(AWS) instances. All the software and data used in the workshop are 
-hosted on an Amazon Machine Image (AMI). For information about how to
-use the workshop materials, see the 
-[setup instructions](http://www.datacarpentry.org/genomics-workshop/setup/) on the main workshop page.
+This lesson requires a working spreadsheet program. If you don't have a spreadsheet program already, you can use LibreOffice. It's a free, open source spreadsheet program.
+
+#### Windows
+
+- Download the Installer 
+  - Install LibreOffice by going to [the installation page](https://www.libreoffice.org/download/libreoffice-fresh/). The version for Windows should automatically be selected. Click Download Version X.X.X (whichever is the most recent version). You will go to a page that asks about a donation, but you don't need to make one. Your download should begin automatically.
+- Install LibreOffice 
+- Once the installer is downloaded, double click on it and LibreOffice should install.
+
+#### Mac OS X
+
+- Download the Installer 
+  - Install LibreOffice by going to [the installation page](https://www.libreoffice.org/download/libreoffice-fresh/). The version for Mac should automatically be selected. Click Download Version X.X.X (whichever is the most recent version). You will go to a page that asks about a donation, but you don't need to make one. Your download should begin automatically.
+- Install LibreOffice 
+- Once the installer is downloaded, double click on it and LibreOffice should install.
+
+
+#### Linux
+
+- Download the Installer 
+  - Install LibreOffice by going to [the installation page](https://www.libreoffice.org/download/libreoffice-fresh/). The version for Linux should automatically be selected. Click Download Version X.X.X (whichever is the most recent version). You will go to a page that asks about a donation, but you don't need to make one. Your download should begin automatically.
+- Install LibreOffice 
+- Once the installer is downloaded, double click on it and LibreOffice should install.