Final Submission Executable Tutorial - Building and Setup of a Slack …

…Bot (myechui) (#1886)

* Final submission: Presentation (gatien-myechui)

* Demo Proposal: myechui

* Update README.md for myechui demo proposal

* Final submission: GitHub link to demo (myechui)

* Tutorial submission (myechui)

* Delete github-url.txt

contributions/executable-tutorial/myechui/README.md

@@ -24,3 +24,6 @@ In this tutorial, I would like to show how to write and deploy a Slack bot that
 - Reply to a [@mention](https://slack.com/help/articles/205240127-Use-mentions-in-Slack#mention-someone) message
 - Make a HTTP request to query the usage of some services, for example, querying the total number of issues and pull requests of a repository on GitHub
 - Send a message in a channel whenever there is a merge/pull request made in GitHub
+
+Tutorial on Katacoda: https://www.katacoda.com/edchui/scenarios/slack-bot
+Katacoda GitHub Repo: https://github.com/EDChui/katacoda-scenarios