create ExtendingSass.md
Supervised
Merge pull request #5 from mazzo46/ExtendingSass

ExtendingSass.mdの追加
Supervised
Merge pull request #6 from mazzo46/mod_FAQ

【監訳済み】FAQ.md
Update README.md
Merge pull request #7 from mazzo46/mod_OutputStyle

【監訳済み】OutputStyle.md
change file style to css
Merge pull request #8 from Layzie/master

CSSコードをシンタックスハイライト