Added a FAQ section for day 2

The following questions are addressed: 
Should I use templates?
Is it possible to split my syntax definition up in several files possibly in subfolders?
The {bracket} attribute seems to have no effect, how come?
I added something in a .sdf3 file but it does not seem to have any effect but I did not check the generated .sdf file to see if what I added has actually been incorporated, what do I do?
I see no errors in my context-free priorities section but they do not appear in the associated .sdf file, what could be the problem?

I'm not sure if you are okay with this FAQ section. I have tried not to give away information about the solutions to the assignments, just to address small things annoyances and oddities that can get you stuck.