Add initial rust template?

templates/rust/.envrc

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+use flake

templates/rust/.gitignore

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+/target
+/.direnv

templates/rust/flake.nix

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+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs?rev=e4ad989506ec7d71f7302cc3067abd82730a4beb";
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    supportedSystems = ["x86_64-linux"];
+    forEachSupportedSystem = f:
+      nixpkgs.lib.genAttrs supportedSystems (system:
+        f {
+          inherit system;
+          pkgs = import nixpkgs {inherit system;};
+        });
+  in {
+    devShells = forEachSupportedSystem ({
+      pkgs,
+      system,
+    }: {
+      rust-development = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          cargo
+          rustc
+          rustfmt
+          rustPackages.clippy
+          rust-analyzer
+        ];
+      };
+
+      default = forEachSupportedSystem ({system, ...}: self.outputs.${system}.rust-development);
+    });
+  };
+}