Add tutorial template

[uekerman]

It could be helpful to have a tutorials template to copy from for new tutorials.
For contributors as they then have to do less.
For maintainers as contributors are nudged towards consistency.

Such a template could include:

• a README.md with things are readme should / could include
• an INSTRUCTIONS.md with all you have to do if you contribute a tutorial. The contributor should finally delete this file
• a precice-config.xml with some different variants in there. Whatever you don't need, you can delete
• an Allclean script, if there is no global one?
• a gitignore if there is no global one
• an Allrun script with different options in there again

Could be placed directly on the top level.

* CHT
* FSI
* template

Opinions on this?

[MakisH]

I definitely aggree that we need this!

Regarding Allclean and .gitignore, see also the related issues #88 and #87, respectively.

Regarding the location, top-level is good. Related issue there: #28.

[IshaanDesai]

If Allrun and Allclean scripts are provided in the template would it be assumed that the folder structure is also part of the template? The folder structure itself can be finalised then.
A possible far-future concern would be: when we have tutorials with more than two participants and with participants other than Fluid/ and Solid/. At that point the template can be generalized further.

[MakisH]

We already have tutorials with more than two participants (and often special steps), so I am not so sure about Allrun. But Allclean we can write in a rather general way.

[MakisH]

Let's not add a template, only extensive contributing guidelines.