GreenGrassManager-V1.0.3

This document is about how to use AWS’s GreenGrass on InHand’s IG902. Since we has set the environment for GreenGrass in IG912, preinstalled the AWS SDK AWSIoTPythonSDK, you just need to do a little. More importantly, in order to make things easy, we write an APP called GreenGrassManager to manage GreenGrass, which automatically finishing some operations and you don’t need to do it by yourself, Pay attention, when you do Model3 to Model6 in AWS document, you should make sure your greegrass daemon process is running right in IG902.