create tutorial how to use jenkins

[floweisshardt]

• example configuration with prio_build jobs (explain manual trigger and scm trigger)
  • without dependencies
  • with dependencies
  • trigger by changes in dependencies
• extension to regular_builds
• extension to nongraphics_tests (testing repo only and testing dependencies) (- extension to graphics_tests (example of navigation tests)) (- hw_build) (- hw_test)