Add initial help text

Julien LepillerSat Jun 06 19:35:19+0200 2020

4dbab04

nani/app/furiganatextview/src/test/java
namelast commitdate
eu/Add furiganaMon Apr 15 20:09:48+0200 2019
se/Add furiganaMon Apr 15 20:09:48+0200 2019