add instructions for using GUI, with screenshots
updates to index.html and new screenshots
add the screenshots
Updates, basic CLI usage, new Maven screenshot
add more on installation
minor redrafting for clarity, add note about -p flag
typo
text updates and replacement images for progress bar
Describe differences between ui and cmd packages
fix broken link
explain need for Java, and what's in downloads
add additional screenshot
Explain saving validator output and closing
update for release of RC3
correct image file name
add description of new option
update screenshots for RC3
typo
fix extension case for one image
expand command line instructions