feat: added template for Rust flakes

dev-templates/rust-minimal/flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "A minimal Rust development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          cargo
+          clippy
+          rust-analyzer
+        ];
+      };
+    };
+}
+