readme.md

support samples and TRT plugins

Samples	TRT OSS Plugin	TPG support
onnx-packnet	groupNormalizationPlugin	Yes
efficientdet	EfficientNMSPlugin	Yes
pointpillar	PFP,ScatterBEV	Yes
yolov4	BatchedNMSPlugin	Yes
mnist_with_coordconv	coordConvACPlugin	Yes