[Feature] CSS Basic architecture  

Preview: <a href="https://github.com/bblurock/sms-coding-standard/blob/front-end-BEM-draft/CSS.md">here</a>
BEM like 的 css 可以參考 Ghost.io
https://github.com/TryGhost/Ghost/tree/master/core/client

https://github.com/TryGhost/Ghost/tree/master/core/client/assets/sass

他們走的是無底線設計