Add new AUR package

● Publishing to AUR

First time only:

1. Create an account at https://aur.archlinux.org and register your SSH key
2. Clone the (empty) AUR package repo:
   git clone ssh://aur@aur.archlinux.org/your-repo.git

Every release:

1. Run gradle build_all
2. Upload your-repo${version}.tar to GitHub Releases (tag must match
   the version, e.g. 1.3.0)
3. Copy the generated files into the AUR clone:
   cp dist/AUR/PKGBUILD dist/AUR/.SRCINFO ~/home/user/your-aurgit-folder
4. Commit and push:
   cd ~/home/user/your-aurgit-folder
   git add PKGBUILD .SRCINFO
   git commit -m “Update to ${version}”
   git push or