Tutorial 1 startup not understandable

[aliverud]

This text is not understandable if you are unfamiliar to thingml and Eclipse:
"To check if the ThingML editor is properly installed, open a sample ".thingml" file. It should open with the ThingML editor (text editor with syntax highlighting). To check if the compilers are properly installed, right-click on a ".thingml" file. You should have a "HEADS / ThingML" sub-menu in the context menu. This sub-menu allows calling the different ThingML compilers."

There are no .thingml file available in the bundle, and where to find the "context menu" is not obvious.