added icons and .desktop file

flake.nix

@@ -13,11 +13,23 @@
   }: let
     system = "x86_64-linux";
     pkgs = nixpkgs.legacyPackages.${system};
-  in {
-    packages.${system} = let
+
     name = "scannedImageExtractor";
   in {
-      default = pkgs.gccStdenv.mkDerivation {
+    packages.${system} = {
+      default = let
+        desktopItem = pkgs.makeDesktopItem {
+          inherit name;
+
+          exec = name;
+          desktopName = "Scanned Image Extractor";
+          terminal = false;
+          icon = name;
+          mimeTypes = ["x-content/image-dcf"];
+          categories = ["Graphics" "Photography" "GNOME" "KDE"];
+        };
+      in
+        pkgs.gccStdenv.mkDerivation {
           inherit name;
           src = ./.;
 
@@ -29,14 +41,24 @@
             libsForQt5.qt5.wrapQtAppsHook
           ];
 
-        dontUseCmakeConfigure = true;
-        buildPhase = ''
+          configurePhase = ''
             cmake scannerExtract -DCMAKE_BUILD_TYPE=release -DOPENCV2=1
+          '';
+
+          buildPhase = ''
             make
           '';
 
           installPhase = ''
             install -m 555 ${name} -Dt $out/bin
+
+            # Install .desktop file
+            install -m 444 ${desktopItem}/share/applications/${name}.desktop -Dt $out/share/applications
+
+            # Install icons
+            for dimension in 128 256; do
+              install -m 444 $src/scannerExtract/ico/${name}''${dimension}x''${dimension}.png -D $out/share/icons/''${dimension}x''${dimension}/apps/${name}.png
+            done
           '';
         };
 
@@ -55,6 +77,15 @@
         };
     };
 
+    apps.${system} = {
+      appImage = {
+        program = "${pkgs.writeShellScript "scannedImageExtractor" ''
+          ${pkgs.appimage-run}/bin/appimage-run ${self.packages.${system}.appImage}/${name}.AppImage
+        ''}";
+        type = "app";
+      };
+    };
+
     devShells = {
       default = pkgs.mkShellNoCC {
         packages = with pkgs; [