Add nix flake

flake.nix

@@ -0,0 +1,66 @@
+{
+  description = "High-performance computing projects";
+
+  inputs = {
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    nixpkgs.url = "github:nixos/nixpkgs?ref=refs/heads/master";
+    nixpkgs-asciidoc.url = "github:zebreus/nixpkgs?ref=f1a3be7a1160cc4810c0274ab76f0fac813eb4d6";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+      nixpkgs-asciidoc,
+      fenix,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      with nixpkgs.legacyPackages.${system};
+      let
+        pkgs-with-asciidoc = import nixpkgs-asciidoc { inherit system; };
+        pkgs-fenix = fenix.packages.${system};
+      in
+      rec {
+
+        name = "high-performance-computing";
+        packages.default = llvmPackages_16.stdenv.mkDerivation {
+          name = name;
+          src = ./.;
+
+          buildInputs = [
+            llvmPackages_16.openmp
+            gcc12
+            clang_16
+
+            openmpi
+            gnumake
+            zlib
+            sshfs
+
+            clang-tools_16
+            lldb
+            nil
+
+            (pkgs-fenix.complete.withComponents [
+              "cargo"
+              "clippy"
+              "rust-src"
+              "rustc"
+              "rustfmt"
+            ])
+            pkgs-fenix.rust-analyzer
+            python3
+            gnumake
+            cmake
+            protobuf
+          ];
+        };
+      }
+    );
+}