Add location where to download sourcetree and fork

README.md

@@ -2,6 +2,8 @@
 
 ## Using a GUI
 You can use any GUI for git, the ones we use are Fork and Sourcetree
+You can download these at https://www.sourcetreeapp.com/ and https://git-fork.com/
+
 
 ## Set up git
 Set up your git info