@gibran the documentation for the ADK is included in the ZIP file available for download from the Member's Zone that is accessible only to registered users of Amibroker.
If you are already a customer you should have received the information to access it.
By the way, I see that your account here in the community forum does not show yet the License Verified badge that is required to be allowed freely to post in this section of the forum.
I kindly suggest to go ahead and verify your status as soon as possible.