translate contribute/_index.md to japanese.

[silverskyvicto]

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Remember to delete this note before submitting your pull request.

For pull requests on 1.15 Features: set Milestone to 1.15 and Base Branch to dev-1.15

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#13395

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[makocchi-git]

@silverskyvicto こちらのガイドに従って英語と日本語の間はスペース無しでお願いします

[makocchi-git]

あと Additional ways to contribute の部分が抜けているのでそこもお願いします

[makocchi-git]

toolingの部分はツールよりも作業と訳した方が意味が分かりやすいかなと思いますが、いかがでしょうか

[silverskyvicto]

確かにそうですね。

[makocchi-git]

/lgtm

[cstoku]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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