feat: add cpp template

templates/cpp/flake.nix

@@ -0,0 +1,62 @@
+# heavily inspired by https://github.com/nulladmin1/nix-flake-templates/blob/main/cpp-cmake/flake.nix
+{
+  description = "C++ Flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    systems.url = "github:nix-systems/default";
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , systems
+    , ...
+    }:
+    let
+      forEachSystem = nixpkgs.lib.genAttrs (import systems);
+      pkgsFor = forEachSystem (system: import nixpkgs { inherit system; });
+
+      pname = "name";
+    in
+    {
+      formatter = forEachSystem (system: pkgsFor.${system}.nixpgks-fmt);
+
+      devShells = forEachSystem (system: {
+        default = pkgsFor.${system}.mkShell {
+          packages = with pkgsFor.${system}; [
+            libllvm
+            cmake
+            gtest
+            cppcheck
+            valgrind
+            doxygen
+            clang-tools
+            # cudatoolkit
+          ];
+        };
+      });
+
+      packages = forEachSystem (system: {
+        default = pkgsFor.${system}.stdenv.mkDerivation {
+          inherit pname;
+          version = "0.1.0";
+          src = ./.;
+
+          nativeBuildInputs = with pkgsFor.${system}; [
+            cmake
+          ];
+          buildInputs = with pkgsFor.${system}; [
+            gtest
+          ];
+        };
+      });
+
+      apps = forEachSystem (system: {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/${pname}";
+        };
+      });
+    };
+}