adding vst nix packages

packages/chair-audio/cymb.nix

@@ -0,0 +1,48 @@
+{ stdenv, pkgs, fetchurl, lib, unzip, autoPatchelfHook, makeWrapper, ... }:
+
+stdenv.mkDerivation rec {
+  pname = "Excite Cymbal Pro";
+  version = "latest";
+  src = ../../binary-installers/excite_cymbal_pro-v1.0.1.zip;
+  nativeBuildInputs = [ makeWrapper unzip autoPatchelfHook ];
+  buildInputs = with pkgs; [
+    freetype
+    fontconfig
+    alsa-lib
+    pipewire
+    curl
+    stdenv.cc.cc.lib
+    xorg.libICE
+    xorg.libSM
+    xorg.libX11
+    xorg.libXext
+    xorg.libXcursor
+    xorg.libxkbfile
+    zulip.out
+    xcb-util-cursor
+    libxkbcommon
+  ];
+
+  unpackPhase = ''
+    unzip $src
+  '';
+
+  installPhase = ''
+    mkdir -p $out/lib/vst3
+    cp -r excite_cymbal_pro/excite_cymbal_PRO.vst3 $out/lib/vst3/
+  '';
+
+  postFixup = ''
+    for file in \
+      $out/lib/vst3/excite_cymbal_PRO.vst3/Contents/x86_64-linux/excite_cymbal_PRO.so
+    do
+      patchelf --set-rpath "${lib.makeLibraryPath buildInputs}" $file
+    done
+  '';
+
+  meta = with lib; {
+    homepage = "https://www.chair.audio/";
+    description = "Excite Cymbal Pro";
+    platforms = platforms.linux;
+  };
+}