add some descriptions
add some descriptions

suryasingh/ngHandsontable,handsontable/ngHandsontable,deenairn/ngHandsontable,handsontable/ngHandsontable,mattlucas121/ngHandsontable,kalrover/ngHandsontable,viktor-hunko/ngHandsontable,deenairn/ngHandsontable,AzharWeb/ngHandsontable,suryasingh/ngHandsontable,mattlucas121/ngHandsontable,kalrover/ngHandsontable,AzharWeb/ngHandsontable,viktor-hunko/ngHandsontable