For fast start you can go through tutorial
More links:
Documentation: https://jdi-docs.github.io/jdi-dark - different types of documentation from introduction and tutorial to technical methods documentation
Highlights + fast start example: https://jdi-docs.github.io/jdi-dark/?java#highlights
Tutorial: https://jdi-docs.github.io/jdi-dark/#tutorial - helps to get main ideas on practice
Project templates: https://github.com/jdi-templates - for fast projects start
Examples: https://github.com/jdi-examples
Increase test performance examples
JDI Dark – is the test Framework for services testing that makes your tests fast and sustainable and provides obvious and predictable test run result
-Obvious Service Object Model that helps to reduce test development effort and increase its speed
-REST and SOAP web service design support
-Extended capabilities of REST Assured framework with all its features kept
-Simple interface for sending requests and response analysis
-Automated service objects generation both for REST and SOAP
-Support of the BDD approach
-Retrying of failed tests with specified number of attempts
-Detailed logging of requests and responses in JSON format which can be used in your reports
Run test execution automatically and correct tests if any changes in services happen, provide good reports for test project team and recommendations on how the project can be improved
Site: http://jdi.epam.com/
VK: https://vk.com/jdi_framework
Facebook: https://www.facebook.com/groups/jdi.framework/
You can ask your questions on StackOverflow with 
Get Help in active users Slak chat: https://join.slack.com/t/jdi-family/shared_invite/zt-toag8fgg-ppPiW~lZDU9873JAiSwTJw
(Depricated) Get Help in active users Skype chat: https://join.skype.com/clvyVvnZvWqc