chore: reorganized packaging related files

Signed-off-by: k4yt3x <i@k4yt3x.com>

packaging/arch/PKGBUILD

@@ -0,0 +1,27 @@
+pkgname=video2x
+pkgver=r843.e09f348
+pkgrel=1
+pkgdesc="A machine learning-based lossless video super resolution framework"
+arch=('x86_64')
+url="https://github.com/k4yt3x/video2x"
+license=('AGPL3')
+depends=('ffmpeg' 'ncnn' 'vulkan-driver' 'opencv' 'spdlog')
+makedepends=('git' 'cmake' 'make' 'clang' 'pkgconf' 'vulkan-headers' 'openmp')
+
+pkgver() {
+    printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
+}
+
+prepare() {
+    git submodule update --init --recursive
+}
+
+build() {
+    cmake -B build -S .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
+    cmake --build build --config Release --parallel
+}
+
+package() {
+    DESTDIR="$pkgdir" cmake --install build
+}
+