[Document] add notebook instruction (#1590)
[Document] add notebook instruction (#1590)

* add notebook instruction

* remove extra line

* remove notebook

* merge to one line

qiuxin2012/BigDL,i8run/BigDL-1,yiheng/BigDL,i8run/BigDL-1,qiuxin2012/BigDL,i8run/BigDL-1,qiuxin2012/BigDL,wzhongyuan/BigDL,luchy0120/BigDL,luchy0120/BigDL,wzhongyuan/BigDL,luchy0120/BigDL,wzhongyuan/BigDL,zhangxiaoli73/BigDL,jenniew/BigDL,yiheng/BigDL,yiheng/BigDL,jenniew/BigDL,zhangxiaoli73/BigDL,zhangxiaoli73/BigDL,jenniew/BigDL