In the directory where you installed the SDK, create a file in your preferred language. In the file, include the following code to make the SDK available, and configure your environment with your application credentials.
Indeed I don't know if I put this file in the right place.
On the other hand in the readme of the sdk, here is what we find:
*NOTE*: This SDK is still in beta, is subject to change, and should not be used in production.
I don't know what to do anymore, thanks for your help.