Add a .github folder, with pull request and issue templates to all repos

[gep13]

@pascalberger what are your thoughts on this?

[pascalberger]

@gep13 Not sure about this one. Do we have a common workflow and specific points / information which we want to ask for?

[gep13]

@pascalberger I was thinking of things like the following:

• Cake Version being used
• Addin Version being used
• OS being used
• etc

[pascalberger]

@gep13 That would make sense