Create a desktop shortcut to FCPrimal.exe which is located in the bin folder
Right click on the desktop shortcut and select properties.
In the Target box add the text -skipintro at the end of the line
Click apply.
Launch the game.
NOTE:
This is what my target box looks like
"G:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\games\Far Cry Primal\bin\FCPrimal.exe" - skipintro