Add initial README

README.md

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+# Docker Debugging Disco 🪩
+
+Bust some docker troubleshooting moves 🕺
+
+## Pre-party checklist 📋
+
+- [ ] [Install Docker](https://docs.docker.com/engine/install/)
+- [ ] Clone this repository
+- [ ] Make sure you have ~1GB free disk space
+
+## Start the jam 
+
+Each numbered subfolder contains a funky docker challenge.
+
+You'll know that things are working when you can access http://localhost:8000 and see the number of your challenge.
+
+So, to get started, boogie on over to challenge #1:
+
+```
+cd 1 
+docker compose up
+```
+
+NOTE: if you get a Docker error message running `docker compose`, you might be on a vintage version of Docker – no worries, either update if possible, or [install Docker Compose Standalone](https://docs.docker.com/compose/install/standalone/) and run `docker-compose` (with a hyphen) instead