You want to import a library not an example.
Arduino Folder
|-- libraries
|--HX711
|--HX711.cpp
|--HX711.h
ex:
C:\Program Files (x86)\arduino-1.8.5-windows\arduino-1.8.5\libraries\HX711
Put the files in a folder called HX711 to have everything nice and tidy.
You can put the .ino example in your sketchbook or examples folder. I would just put the libraries in the folder or create a subfolder called examples in the lib folder if you don't want to misplace things.
I use the standalone version of arduino ide, if you have it installed I suspect the folder would be under
My Documents\Arduino\libraries\
According to the documentation.