Update README.md

1. DirectoryFilter_C# is the solution for this online coding challenge. 
2. t2_silverstripe folder contains the google store locator files I was working one.
3. mainstyle_desktop_industrialSteps.css is the main style for http://www.industrialsteps.com/
which is a classic PHP site. 
4. responsive_freelancer_projects.css is from a freelancer maintanence work. 
5. wordpress_functions_medibankcf.php is functions.php file of http://www.medibankcf.com.au/
6. up_salesorder_finalise.sql is a stored procedure I worked on when I was in retail direction.