added bash options

modules/programs.nix

@@ -1,6 +1,14 @@
 { pkgs, config, lib, ... }:
 
 {
+  # Bash usability & speed settings
+  # Auto-complete for bash commands and flags (press Tab!)
+  programs.bash.completion.enable = true; # Optional
+  # Adds color to your 'ls' command (makes folders, files, etc. colorful)
+  programs.bash.enableLsColors = true; # Optional
+  # Lets you search for commands from packages you haven't installed yet (via `nix-index`)
+  programs.nix-index.enableBashIntegration = true; # Optional
+
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [