Add files from template and modify

.cargo/config.toml

.gitignore

Cargo.lock

Cargo.toml

README.md

Trunk.toml

assets/favicon.ico

assets/icon-1024.png

assets/icon-256.png

assets/icon_ios_touch_192.png

assets/manifest.json

assets/maskable_icon_x512.png

assets/sw.js

index.html

src/app.rs

src/lib.rs

src/main.rs