Add README.md

Author: Anna-Rehm

README.md

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+**IMPORTANT: Have docker installed!**
+
+### Hopefully "foolproof" instructions:
+1. Clone repository
+2. Move into Image Folder `cd Images/qiita`
+3. Build docker image `docker build . -f qiita/Dockerfile -t qiita`
+4. Move to folder containing compose file `cd ../..`
+5. Run docker compose `docker compose up`
+6. To stop: Run `docker compose down`
+    - Use `docker compose down --volumes`if you wish to remove the database volume as well.