Locate the 'DrTechniko' workshop materials on Devoxx4Kids. Identify the core programming concept taught in this workshop, list the main tools required for participation, and determine the method for contributing new signs or materials to Devoxx4Kids workshops.
Navigate to the 'Materials' page. Click on the 'Workshops' link. Click on the 'DrTechniko Materials Page' link. Identify the core programming concept taught in the DrTechniko workshop. List the main tools required for the DrTechniko workshop. Determine how new signs or materials can be contributed to the Devoxx4Kids workshops.
State that the DrTechniko workshop teaches programming concepts without a computer, focusing on defining paths. List 'paper and colored pencil' as the main tools required. State that new signs or materials can be contributed via a GitHub pull request.