Add a flake for a dev shell

Author: rotmh

DEPENDENCIES.md

@@ -33,3 +33,49 @@ pkgs.mkShell rec {
     builtins.foldl' (a: b: "${a}:${b}/lib") "${pkgs.vulkan-loader}/lib" buildInputs;
 }
 ```
+
+Alternatively, you can use this `flake.nix` to create a dev shell, activated by `nix develop`:
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+
+        buildInputs = with pkgs; [
+          expat
+          fontconfig
+          freetype
+          freetype.dev
+          libGL
+          pkg-config
+          xorg.libX11
+          xorg.libXcursor
+          xorg.libXi
+          xorg.libXrandr
+          wayland
+          libxkbcommon
+        ];
+      in {
+        devShells.default = pkgs.mkShell {
+          inherit buildInputs;
+
+          LD_LIBRARY_PATH =
+            builtins.foldl' (a: b: "${a}:${b}/lib") "${pkgs.vulkan-loader}/lib" buildInputs;
+        };
+      }
+    );
+}
+```