add envrc

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "Rust dev flake";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs {inherit system;};
+  in {
+    devShells."x86_64-linux".default = pkgs.mkShell {
+      nativeBuildInputs = with pkgs; [
+      ];
+      buildInputs = with pkgs; [
+        rustc
+        rust-analyzer
+        rustfmt
+        clippy
+        cargo
+        cargo-watch
+      ];
+      shellHook = ''
+        echo "Shell prêt"
+      '';
+    };
+  };
+}