Update README.md with contribution information

Julien LepillerThu Apr 18 14:25:39+0200 2019

54b501d

nani/app/furiganatextview
namelast commitdate
.gitignoreAdd furiganaMon Apr 15 20:09:48+0200 2019
build.gradleAdd furiganaMon Apr 15 20:09:48+0200 2019
proguard-rules.proAdd furiganaMon Apr 15 20:09:48+0200 2019
src/Add furiganaMon Apr 15 20:09:48+0200 2019