added Configuring Environments via package.json section to readme
added Configuring Environments via package.json section to readme

justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs,justadudewhohacks/opencv4nodejs