Create faq.md
Create faq.md

Former-commit-id: b2238b826af3eaaecd8f07635e175dd5d10e008a [formerly b2238b826af3eaaecd8f07635e175dd5d10e008a [formerly d99c87a105ce10660f07a8ee55c4c66f07d22a1a]]
Former-commit-id: f6b9667fec72be948a7f59ea0b2cf6be62a9398e
Former-commit-id: 5d64af6c50d06802e1de2f7677e24a6782bf8d51
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine