added FAQ on static assets

early draft - review welcome
added example for static assets

not very convincing though - suggestions welcome
rephrased static assets rationale

thanks to @cdent:
https://github.com/FND/ROCA/commit/dc20e5fd72202d263cf0b184eceb95b14d6bcea5#commitcomment-3496891
simplified phrasing

s/rendered ineffective/lost/

as suggested by @stilkov
Merge pull request #16 from FND/faq

FAQ for static assets