add shell.nix file

shell.nix

@@ -0,0 +1,30 @@
+{ pkgs ? import <nixpkgs> {} }:
+  let
+    libPath = with pkgs; lib.makeLibraryPath [
+      libGL
+      libxkbcommon
+      wayland
+    ];
+  in {
+    devShell = with pkgs; mkShell {
+      buildInputs = [
+        cargo
+        pkg-config
+        libxkbcommon
+        glib
+        gst_all_1.gstreamer
+        gst_all_1.gst-plugins-base
+        gst_all_1.gst-plugins-good
+        gst_all_1.gst-plugins-bad
+        gst_all_1.gst-plugins-ugly
+        gst_all_1.gst-libav
+        gst_all_1.gst-vaapi
+        rustc
+        rust-analyzer
+      ];
+      
+      RUST_LOG = "debug";
+      RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+      LD_LIBRARY_PATH = libPath;
+    };
+  }