Documentation for creating or importing projects missing

[kgiannakakisATC]

I initially tried to open a thingml file directly into Eclipse (without a project) and got an error. I had to create a General project and add the thingml there. It was far easier to import the project from GitHub, but at first I didn't at what level to do the import. There is a single file containing all tutorials. It would be nice for all of these to be documented.