feat(templates): add nix-shell framework and template

Add support for nix-shell as a new framework option, including a corresponding template file for setting up a development environment. This enhancement allows users to easily create and manage nix-shell environments for their projects.

Author: npv2k1

src/templates.ts

@@ -42,6 +42,18 @@ export const FRAMEWORKS: Framework[] = [
       },
     ],
   },
+  {
+    name: "nix",
+    display: "nix",
+    color: yellow,
+    variants: [
+      {
+        name: "nix-shell",
+        display: "nix shell",
+        color: blue,
+      },
+    ],
+  },
   {
     name: "nestjs",
     display: "NestJS",

templates/template-nix-shell/shell.nix

@@ -0,0 +1,21 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    # Development tools
+    git
+    gnumake
+    
+    # Add your project-specific dependencies here
+    # For example:
+    # nodejs
+    # python3
+    # rustc
+    # cargo
+  ];
+
+  shellHook = ''
+    echo "Welcome to development environment!"
+    # Add any shell initialization commands here
+  '';
+}