Add docs/content for reference to make Doc_ja FSharp.Formatting
Translate index.fsx in Japanese into ja/index_ja.fsx
Modify file-encoding from cp932 to utf-8
Modify translation of 'help'
Merge pull request #18 from Gab-km/index/beFormatting

Translate index.fsx in Japanese into ja/index_ja.fsx
ref #17