adding covid-tweets-japanese (again)
README.md is not created yet. I'll add it soon. Thank you for your detailed code review! It's so helpful.
I'll reflect them to the code in 24 hours.

You may have told me in Slack (I cannot find the conversation log though I've looked through threads), but I'm sorry it seems I'm still misunderstanding how to get YAML from the tagger.
I'm now asking on Slack if I am looking at the tagger the wrong way. One more thing I'd like to ask.
Should I make changes by myself, or can I use the "Commit suggestion" feature?
I'm new to this feature and I don't know how the rules work in this repository, so I'd like to ask just in case. Thank you very much for merging!
I had mistaken use git rebase, I was so hurried to fix it. However, I didn't fully consider the use of git reset , so I unintendedly stopped PR (#1367) altogether. Sorry about that.
I'll make a new PR.