Android: automatically switch themes between dark/light


Creat an option that allows the theme to change automatically.

app version: 9.0
android version: 9 (PPS29.55-24)
device: motorola moto g(6) (msm8953)
sqlite version: 3.22.0
username: drhouse
server: default
speed: 5 feeds in conn:825 read:5 parse:14 store:5
pending actions: pre:0 post:0
premium: no
prefetch: yes
notifications: no
keepread: no
thumbs: yes