Add some nice introduction to Modelica

[HansOlsson]

The Modelica language now refers to the tutorials, but I think we need to have:

• A shorter introduction; preferable in multiple formats: video and text
• Additional tutorials (a bit longer) also in multiple formats

[dzimmer]

#88 is a good suggestion. Maybe we have an intermediate Solution. Will depend on the implementation effort

I will care about tutorial material. If someone has good material that I am not aware of, please notify me.

[casella]

I started learning Modelica in 2001 with the Modelica 1.4 tutorial. I still think that was very good. I would suggest that we update it to Modelica 3.6 and post it on our website.

In fact, most of the later additions to the language were advanced features. The only basic thing missing is initial equations, those should be discussed.