Update for lite plan
Update for lite plan

Document how to use the new "lite" plan
aprilwebster/personality-insights-nodejs,watson-developer-cloud/personality-insights-nodejs,jcarboneri/simple-tc-pi-blx-demo,watson-developer-cloud/personality-insights-nodejs,jcarboneri/simple-tc-pi-blx-demo,aprilwebster/personality-insights-nodejs