Update README.md

Author: githubteacher

README.md

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-This repository is a starter portfolio that you can use to learn a little bit about communication using Markdown.
+## Your GitHub Learning Lab Repository for Communicating Using Markdown
+
+Welcome to **your** repository for your GitHub Learning Lab course. This repository will be used during the different activities that I will be guiding you through, oh, I haven't introduced myself...
+
+I'm the GitHub Learning Lab bot and I'm here to guide you in your journey to learning and mastering the various topics covered in the GitHub Pages course. I will be using Issue and Pull Request comments to communicate with you. In fact I already added an issue for you to checkout.
+
+![issue tab](https://lab.github.com/public/images/issue_tab.png)
+
+I'll meet you over there, can't wait to get started!