nixos/development-tools: Add direnv and nix-direnv

modules/programs/development-tools/development-tools.nix

@@ -10,5 +10,12 @@
       clang
       gcc
     ];
+
+    programs.direnv = {
+      enable = true;
+      enableZshIntegration = true;
+      silent = true;
+      nix-direnv.enable = true;
+    };
   };
 }