❄️ Add Nix shell

TODO.md

@@ -3,7 +3,7 @@
 - [ ] License
 
 ## Code
-- [ ] Nix Shell
+- [x] Nix Shell
 - [ ] Analytics
 - [ ] Organize code better
 - [ ] Type slug of project

flake.lock

@@ -0,0 +1,44 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1751211869,
+        "narHash": "sha256-1Cu92i1KSPbhPCKxoiVG5qnoRiKTgR5CcGSRyLpOd7Y=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "b43c397f6c213918d6cfe6e3550abfe79b5d1c51",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1751271578,
+        "narHash": "sha256-P/SQmKDu06x8yv7i0s8bvnnuJYkxVGBWLWHaU+tt4YY=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "3016b4b15d13f3089db8a41ef937b13a9e33a8df",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-unstable": "nixpkgs-unstable"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,36 @@
+{
+  description = "martials.no Development environment";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+  };
+
+  outputs = { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+    in
+    {
+      devShells.${system}.default =
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+          };
+        in
+        pkgs.mkShell {
+          packages = with pkgs; [
+            git
+          ] ++ [
+            # Node
+            nodejs_22
+            pnpm
+          ] ++ [
+            nodePackages.prettier
+          ];
+
+          shellHook = ''
+            pnpm install
+            fish
+          '';
+        };
+    };
+}