[jlreq] Pull Request: added markdown text as explainer, from google docs used in discussion

himorin has just submitted a new pull request for https://github.com/w3c/jlreq:

== added markdown text as explainer, from google docs used in discussion ==
converted as some sort of explainer from [google docs](https://docs.google.com/presentation/d/1x-cIsFinp4MKQkNve4UWAQ0_GTR22hX2PwIYc6MrOS4/edit), made by Murata-san and updated during discussion call.

check [page in branch](https://github.com/himorin/jlreq/blob/english-ruby-term-explainer/docs/english-ruby-terminology/explainer.md) for review in HTML format.

See https://github.com/w3c/jlreq/pull/331


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