update readme

README.md

@@ -18,6 +18,27 @@ dragnpkgs provides a set of nixos modules and a nixpkgs overlay containing custo
 }
 ```
 
+alternatively, add it as a nix channel
+```bash
+nix-channel --add https://git.lain.faith/haskal/dragnpkgs/archive/main.tar.gz dragnpkgs
+```
+
+then in system config
+```nix
+{config, lib, pkgs, ...}:
+{
+  imports = [
+    <dragnpkgs>
+  ];
+}
+```
+
+for standalone nix on other distros, use `~/.config/nixpkgs/overlays.nix` to enable the dragnpkgs
+overlay
+```nix
+(import <dragnpkgs> {}).nixpkgs.overlays
+```
+
 ## options documentation
 
 documentation for options provided by dragnpkgs