It may sound that this question is a duplicate of:
How to properly configure AdMob using IntelliJ IDEA?
But it isn't! (Specially because that question is from 2011, and the google-process changed (As it seems)). I'm following this google-reference for proper setup.
First of all, there's the "Using Android Studio" option, and I have no idea of what that is. Then, I went to the next one: "Using Eclipse or another IDE", then there is a note, that was pretty straight-foward.
I've selected my project on IntelliJ Idea, pressed F4 (Open Module Settings) and went to SDKs in Platform Settings and just added the folder they asked (extras\google\google_play_services). Supposing that this is the correct way to "add the google ad library", I continued and added to the manifest file what they asked for. When I compile the app, I get the error:
D:\Computer Programming\IdeaProjects\Black Square\AndroidManifest.xml:8: error:
Error: No resource found that matches the given name (at 'value' with value '@integer/google_play_services_version').
So, as it seems, I did not import it correctly (And from this part on, I don't know how to proceed).