Executable tutorial: CI workflow using GitHub actions for Node.js Exp…

…ress app, including automated testing and linting using Jest and Eslint (#1116)

* docs: add tutorial proposal

* docs: update README

Co-authored-by: andnil5 <andnil5@kth.se>

contributions/executable-tutorial/andnil5-nwessman/README.md

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+# Executable tutorial: CI workflow using GitHub actions for Node.js Express app, including automated testing and linting using Jest and Eslint
+
+## Members
+Anders Nilsson (andnil5@kth.se) Github: [andnil5](https://github.com/andnil5)
+
+Niklas Wessman (nwessman@kth.se) Github: [nwessman](https://github.com/nwessman)
+
+## Proposal
+We will create a [Katacoda](https://www.katacoda.com/) executable tutorial including:
+* A short introduction to automated testing with Jest, Linting with Eslint, and CI using GitHub actions.
+* How to write mocha tests with Jest to test API endpoints on a simple Express application.
+* How to set up a simple Eslint linter.
+* How to create a CI workflow with GitHub actions, including automated tests and linting.