add nixos stuff

.envrc

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+eval "$(lorri direnv)"

default.nix

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+with import <nixpkgs> { };
+with pkgs;
+
+stdenv.mkDerivation {
+  name = "AntSimulator";
+  version = "dev";
+  src = lib.cleanSource ./.;
+
+  nativeBuildInputs = [
+    cmake
+  ];
+
+  buildInputs = [
+    sfml
+  ];
+
+  preBuild = ''
+    cmake .
+  '';
+
+  buildPhase = ''
+   make debug
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp AntSimulator $out/bin/
+    cp compile_commands.json $out/
+  '';
+
+  enableParallelBuilding = true;
+}

shell.nix

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+{ pkgs ? import <nixpkgs> {} }:
+
+with pkgs;
+
+mkShell {
+  nativeBuildInputs = [
+    gcc
+    gnumake
+    cmake
+    cmake-format
+    clang-tools
+    # ccls
+  ];
+  buildInputs = [
+    sfml
+  ];
+}