Initial CMake project structure

flake.nix

@@ -0,0 +1,21 @@
+# Copyright (c) 2023 jun <https://git.firmwarejun.net/jun/MolecularDynamics2>
+
+{
+  description = "MolecularDynamics2";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [ gcc cmake clang gnuplot llvmPackages.openmp bc ];
+        };
+      });
+}