Marshmallow comes with a new feature that asks for app permissions when opening the app. It has the new apple-esque asking for permissions feature. You can choose if an app can use these permissions or not.
If you want to change the permissions later, go to settings and search "Permissions"
If the app requires no permissions, it will not inform you of that.
However, if it requested access to something, it will tell you.
For example, if I just installed Skype and started using the microphone, it will ask if the app can use the microphone. You can decline it or accept it.
