[TYPO3-mvc] Coding Guidlines -> CSS & JS

[S.Korth]

Hey all,

just a small Question. I need some coding guidlines for implementing css 
and/or js into my extbase Extension. Whats the best way? Writing the css 
into an external file or into ts?

For example

http://forge.typo3.org/repositories/browse/extension-mvc_extjs_samples/trunk

There is a css file in the resources, but how did they implement it ?

Thanks,
Sascha