readme: use omnix

README.md

@@ -13,6 +13,13 @@ If you have an *existing* Haskell project, you should probably use https://githu
 
 ## Getting Started
 
+Initialize this template using:
+
+```sh
+nix --accept-flake-config run github:juspay/omnix -- \
+  init github:srid/haskell-template -o ./yourproject
+```
+
 *tldr: [Install Nix](https://nixos.asia/en/install), [setup direnv](https://nixos.asia/en/direnv), open in VSCode, install recommended extensions and run `just run`.*
 
 Full instructions: https://srid.ca/haskell-template/start