Update README.md
Update README.md
Merge pull request #9 from yukihr/master

[監訳希望]import.mdの日本語翻訳
[WIP]translate some

乗算除算まで見直し済み
[WIP]translate some

is definedまでチェック
[WIP]translate some

subscript[]の一部が未翻訳
translate operators
Merge pull request #1 from mitsuruog/work

translate Operators
Merge pull request #10 from mitsuruog/master

[監訳希望] Operators