Add yello world: controller / routes
StaticPage controller by rails generate controller
Revert "Add yello world: controller / routes"

This reverts commit 2888e51d9d00c02cafb2647ce667ce2aa6caa5c2.
Revert "StaticPage controller by rails generate controller"

This reverts commit 618f489d91f37a87eaaaef66323475992186c8c2.
Revert "Revert "Add yello world: controller / routes""

This reverts commit 2d9bcfc03e0d467906b8a2eaf51120fc24da27a3.