Created a boolean  image column that display a image based on the boolean value

#3006
Update README.md

Add readme for the SSBooleanImageColumn
Merge remote-tracking branch 'upstream/master' into feature-image-column-3006
Fix cs errors

#3006
Update copyright

#3006
Update copy right

#3006
Fix cs errors

#3006
Fix comments

#3009
Merge pull request #177 from AlecErasmus/feature-image-column-3006

Feature image column 3006
Add function to datagrid that allows adding a column without
knowing the type of column.

#2724