Add initial rust template

rust/.envrc

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+use flake

rust/flake.nix

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+{
+  description = "Another cool rust disaster from samw.";
+
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+    devshell.url = "github:numtide/devshell";
+    naersk.url = "github:nix-community/naersk";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { self, nixpkgs, utils, naersk, devshell, rust-overlay }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        rust = rust-bin.stable.latest.default;
+        naersk-lib = naersk.lib.${system}.override {
+          cargo = rust;
+          rust = rust;
+        };
+      in {
+        defaultPackage = naersk-lib.buildPackage ./.;
+
+        defaultApp = utils.lib.mkApp { drv = self.defaultPackage."${system}"; };
+
+        # Provide a dev env with rust and rls
+        devShell = let
+          pkgs = import nixpkgs {
+            inherit system;
+
+            overlays = [ devshell.overlay (import rust-overlay) ];
+          };
+        in pkgs.devshell.mkShell {
+          packages = with pkgs; [ (rust.override { extensions = [ "rls" ]; }) ];
+        };
+      });
+}