Added (90%)template flake based nix development shell

flake.nix

@@ -1,7 +1,24 @@
-{pkgs ? import <nixpkgs> {}}:
-pkgs.mkShell {
-  # nativeBuildInputs is usually what you want -- tools you need to run
-  nativeBuildInputs = with pkgs.buildPackages; [
-    emscripten
-  ];
+# Template: https://nixos-and-flakes.thiscute.world/development/intro
+{
+  description = "TinyEMU Nix Dev Shell (Flake-Based)";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+  };
+
+  outputs = {nixpkgs, ...}: let
+    # system should match the system you are running on
+    system = "x86_64-linux";
+  in {
+    devShells."${system}".default = let
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+    in
+      pkgs.mkShell {
+        packages = with pkgs; [
+          emscripten
+        ];
+      };
+  };
 }