Add a basic pkgbuild file and desktop file

PKGBUILD

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+# Maintainer: Your Name <youremail@example.com>
+pkgname=som
+pkgver=1.0.0
+pkgrel=1
+pkgdesc="My Qt6 C++ CMake application"
+arch=('x86_64')
+url="https://example.com"
+license=('GPL')
+depends=('qt6-base')  # add other dependencies your app needs
+makedepends=('cmake' 'gcc' 'make' 'qt6-base')
+source=()
+
+build() {
+    cd ..
+    mkdir build
+    cd build
+
+    # Run CMake
+    
+    cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
+    make
+}
+
+package() {
+    
+echo $PWD
+cd ../build
+echo $PWD
+    # Install the app binary
+    install -Dm755 out/som "$pkgdir/usr/bin/som"
+
+    # Install plugins
+    install -d "$pkgdir/usr/lib/som"
+    cp -r out/plugins/* "$pkgdir/usr/lib/som/"
+
+    # Install the .desktop file
+    install -Dm644 ../som.desktop "$pkgdir/usr/share/applications/som.desktop"
+
+    # Optionally, install an icon if you have one
+    # install -Dm644 ../myapp.png "$pkgdir/usr/share/icons/hicolor/128x128/apps/myapp.png"
+}

som.desktop

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+[Desktop Entry]
+Name=SOM
+Comment=Description of My Qt6 App
+Exec=/usr/bin/som
+Icon=myapp
+Terminal=false
+Type=Application
+Categories=Utility;Development;