edited README, adding acceptance tests for show all and show unread, making installation instructions more clear, suggesting edits for deleting non-linux instructions, deleting milestone 3B info
edited README, adding acceptance tests for show all and show unread, making installation instructions more clear, suggesting edits for deleting non-linux instructions, deleting milestone 3B info

CombustibleLemons/rss-reader,CombustibleLemons/rss-reader,CombustibleLemons/rss-reader