add installation & usage section to each sub package README
add installation & usage section to each sub package README

plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,plotly/plotly.js,etpinard/plotly.js