Add a license to a repository

[frostasm]

First of all, thanks for the working C++ code that uses onnxruntime with yolov5 :+1: Could you please add the license file to the repository so that it is clear how your code can be used in other projects

[zgoey]

Yes, it would be nice to have a non-restrictive license like MIT (https://choosealicense.com/licenses/mit/).