added formal PKGBUILD and postinstall scripts

PKGBUILD

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+# Maintainer: graysky <graysky AT archlinux DOT us>
+# Contributor: Sergej Pupykin <pupykin.s+arch@gmail.com>
+# Contributor: Brad Fanella <bradfanella@archlinux.us>
+# Contributor: [vEX] <niechift.dot.vex.at.gmail.dot.com>
+# Contributor: Zeqadious <zeqadious.at.gmail.dot.com>
+# Contributor: BlackIkeEagle < ike DOT devolder AT gmail DOT com >
+# Contributor: Bartłomiej Piotrowski <bpiotrowski@archlinux.org>
+# Contributor: Maxime Gauduin <alucryd@gmail.com>
+
+pkgname=kodi-standalone-service
+pkgver=1.5
+pkgrel=2
+pkgdesc="Systemd service and user to autostart kodi at boot"
+arch=('any')
+url="https://wiki.archlinux.org/index.php/Xbmc#Autostarting_at_boot"
+license=('GPL')
+depends=('systemd' 'xorg-server' 'xorg-xinit' 'kodi')
+replaces=('xbmc-standalone-service')
+install=readme.install
+source=("https://github.com/graysky2/$pkgname/archive/v$pkgver.tar.gz")
+sha256sums=('10d3077b99d9a2511c3fc38e3ce73436d9de05c765ea4c9c44ca7b8bcd607f85')
+
+package() {
+	install -Dm644 "$srcdir/$pkgname-$pkgver/init/kodi.service" "$pkgdir/usr/lib/systemd/system/kodi.service"
+	install -Dm755 "$srcdir/$pkgname-$pkgver/common/kodi-standalone2" "$pkgdir/usr/bin/kodi-standalone2"
+
+	install -dm 700 "$pkgdir"/var/lib/kodi
+	chown 420:420 "$pkgdir"/var/lib/kodi
+}

readme.install

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+post_install() {
+  getent group kodi > /dev/null || groupadd -g 420 kodi
+  if ! getent passwd kodi > /dev/null; then
+	  useradd -c 'kodi user' -u 420 -g kodi -G audio,video,network,optical -d /var/lib/kodi -s /usr/bin/nologin kodi
+	  passwd -l kodi > /dev/null
+		[[ ! -d /var/lib/kodi/.kodi ]] && mkdir /var/lib/kodi/.kodi && chown -R kodi:kodi /var/lib/kodi/.kodi
+  fi
+}
+
+post_upgrade() {
+  post_install $1
+  if ! getent group kodi | cut -d: -f3 | grep 420 > /dev/null 2>&1; then
+	  groupmod -g 420 kodi > /dev/null 2>&1
+  fi
+  if ! id -u kodi | grep 420 > /dev/null 2>&1; then
+	  usermod -u 420 kodi > /dev/null 2>&1
+	  if [[ $? -ne 0 ]]; then
+		  echo "Changing uid of user kodi failed."
+		  echo "It is recommended that the uid is changed."
+		  echo "Stop all processes running under the kodi user and reinstall kodi"
+		  echo "or change the uid manually. (usermod -u 420 kodi)"
+	  fi
+	  chown -R kodi:kodi /var/lib/kodi
+  fi
+
+	if [[ -d /var/lib/xbmc ]]; then
+		echo "If you are upgrading from xbmc->kodi and wish to keep your"
+		echo "settings, simply follow these steps after the install:"
+		echo 
+		echo "cp -a /var/lib/xbmc/.xbmc/* /var/lib/kodi/.kodi"
+		echo "chown -R kodi:kodi /var/lib/kodi"
+	fi
+}
+
+post_remove() {
+  getent passwd kodi > /dev/null 2>&1 && userdel kodi
+  getent group kodi > /dev/null 2>&1 && groupdel kodi
+}
+
+post_message() {
+	echo "Users of Xorg >=1.16 wishing to autostart kodi standalone"
+	echo "must create or modify /etc/X11/Xwrapper.config to contain"
+	echo "the following 2 lines:"
+	echo
+	echo "allowed_users = anybody"
+	echo "needs_root_rights = yes"
+}