added git ignore file so that files we don't want to upload are not always shown as untracked files
added git ignore file so that files we don't want to upload are not always shown as untracked files

donogst/DotSpatial,pedwik/DotSpatial,JasminMarinelli/DotSpatial,bdgza/DotSpatial,swsglobal/DotSpatial,CGX-GROUP/DotSpatial,JasminMarinelli/DotSpatial,pergerch/DotSpatial,DotSpatial/DotSpatial,pedwik/DotSpatial,swsglobal/DotSpatial,donogst/DotSpatial,bdgza/DotSpatial,JasminMarinelli/DotSpatial,DotSpatial/DotSpatial,DotSpatial/DotSpatial,swsglobal/DotSpatial,pedwik/DotSpatial,CGX-GROUP/DotSpatial,CGX-GROUP/DotSpatial,donogst/DotSpatial,pergerch/DotSpatial,pergerch/DotSpatial,bdgza/DotSpatial