update Contributing.md

CONTRIBUTING.md

@@ -17,3 +17,9 @@ If you want to show up in our Contributors section, please make use of the @all-
 
 Here's a full guide on using the bot: <https://allcontributors.org/docs/en/bot/usage>.
 The simplest way to use it is (in a comment on an issue or a pull-request): `@all-contributors please add <username> for <contributions>`, where `<contributions>` is a [list of contributions](https://allcontributors.org/docs/en/emoji-key).
+
+Here's an [example comment on a PR](https://github.com/rancher/k3d/pull/368#issuecomment-704320376) to tell the bot to add @zeerorg (who had the initial idea for k3s in docker) to the list of contributors for the ideas and code he added:
+
+> @all-contributors please add @zeerorg for ideas and code
+
+The bot will open a PR to add the user to the list and posts the link as a follow-up comment on the issue/PR.