Add PKGBUILD

The one generated with cargo-pkgbuild is really broken

PKGBUILD

@@ -0,0 +1,28 @@
+# Maintainer: Carson McManus <carson.mcmanus1@gmail.com>
+# Contributor: Mads Mogensen <mads256h at gmail dot com>
+
+_pkgname=steamguard-cli
+pkgname=${_pkgname}-git
+pkgver=0.4.0.r5.g6d546e6
+pkgrel=1
+pkgdesc="A command line utility to generate Steam 2FA codes and respond to confirmations."
+arch=('i686' 'x86_64' 'armv6h' 'armv7h')
+url="https://github.com/dyc3/steamguard-cli"
+license=('GPL3')
+makedepends=('rust' 'cargo')
+source=("git+https://github.com/dyc3/steamguard-cli.git")
+sha256sums=('SKIP')
+
+pkgver() {
+    cd "${srcdir}/${_pkgname}"
+    git describe --long --tags | sed 's/\([^-]*-g\)/r\1/;s/-/./g;s/v//g'
+}
+
+build() {
+    cd "${srcdir}/${_pkgname}"
+    cargo build --release
+}
+
+package() {
+    install -Dm755 "${srcdir}/${_pkgname}/target/release/${_pkgname}" "${pkgdir}/usr/bin/${_pkgname}"
+}