Update readme (#6011)
Update readme (#6011)

* update readme

* add disclaimer

himanshug/druid,pjain1/druid,monetate/druid,monetate/druid,mghosh4/druid,gianm/druid,druid-io/druid,nishantmonu51/druid,leventov/druid,implydata/druid,mghosh4/druid,jon-wei/druid,himanshug/druid,jon-wei/druid,mghosh4/druid,nishantmonu51/druid,Fokko/druid,implydata/druid,knoguchi/druid,pjain1/druid,Fokko/druid,michaelschiff/druid,jon-wei/druid,himanshug/druid,mghosh4/druid,nishantmonu51/druid,deltaprojects/druid,druid-io/druid,dkhwangbo/druid,jon-wei/druid,gianm/druid,knoguchi/druid,michaelschiff/druid,dkhwangbo/druid,michaelschiff/druid,pjain1/druid,mghosh4/druid,monetate/druid,mghosh4/druid,michaelschiff/druid,pjain1/druid,Fokko/druid,jon-wei/druid,michaelschiff/druid,leventov/druid,Fokko/druid,druid-io/druid,implydata/druid,mghosh4/druid,gianm/druid,liquidm/druid,Fokko/druid,leventov/druid,leventov/druid,nishantmonu51/druid,monetate/druid,liquidm/druid,nishantmonu51/druid,himanshug/druid,jon-wei/druid,druid-io/druid,deltaprojects/druid,deltaprojects/druid,gianm/druid,deltaprojects/druid,deltaprojects/druid,deltaprojects/druid,knoguchi/druid,leventov/druid,pjain1/druid,implydata/druid,monetate/druid,liquidm/druid,knoguchi/druid,Fokko/druid,monetate/druid,michaelschiff/druid,liquidm/druid,druid-io/druid,michaelschiff/druid,gianm/druid,implydata/druid,Fokko/druid,dkhwangbo/druid,liquidm/druid,jon-wei/druid,knoguchi/druid,dkhwangbo/druid,himanshug/druid,nishantmonu51/druid,monetate/druid,liquidm/druid,pjain1/druid,nishantmonu51/druid,dkhwangbo/druid,deltaprojects/druid,gianm/druid,implydata/druid,gianm/druid,pjain1/druid