Translate "How to interpret phylogenetic trees" to Japanese

We’d like to translate “How to interpret phylogenetic trees” into Japanese. This narrative is referenced in the latest hCov-19 report, and we hope it will help make that one and future situation reports more accessible. The file to translate is ncov_trees-background_ja.md in branch background_ja under the narratives folder: https://github.com/nextstrain/ncov/blob/background_ja/narratives/ncov_trees-background_ja.md

After pushing your changes to GitHub, you can preview the translation here: https://nextstrain.org/community/narratives/nextstrain/ncov@background_ja/trees-background/ja/

Please add your name in parentheses to the end of the author list, so we can credit your work!

Since this narrative explains something more technical, it would be great if the phylogenetics experts can keep their eyes especially on this translation 😃

If more than one of you are working on the document at a time feel free to use a live, online editor like hackmd (sign in with GitHub) to work. The French translation group has found this especially helpful, whatever works best for you.

As always, THANK YOU! It’s an honor to work with you all.

@tomoyuki-nezu, @satotake, @fzhang12

[tomoyuki-nezu]

@cassiawag I think, ready to publish 😃

[fzhang12]

Hi @tomoyuki-nezu @satotake , I’ve integrated all my comments. Your work is great as usual. Could any of you take a look at my changes (mainly on divergence part)?