After clone this project, png file is broken.

All png files(in folder `BeastConsole/Resources/BeastConsole` ) is broken. 

Unity cannot recognize those files, and those files cannot view in picture viewer.(`gwenview`).

I downloaded those pictures manually, then it works well. 
If I do not fix those pictures, Unity will give me a endless warning log output.

I do not install git-lfs plugin, perphaps this is the  problem.