Update README.md

README.md

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-# docker-etherpad
-Etherpad docker image
+# Etherpad Docker
+
+Etherpad docker image with docker-compose support.
+
+## Quickstart 💥
+
+```bash
+docker-compose up -d
+```
+
+## Setup 🏗
+
+```bash
+git clone https://github.com/CupCakeArmy/docker-etherpad
+cd docker-etherpad
+
+# Modify settings
+vim settings.json
+
+# Run
+docker-compose up -d
+```
+
+### (Default) Persist the DB 💽
+
+By default the DB is persisted into `dirty.db`.
+To start with a clean state you need to delete the `dirty.db` file.
+Either run `rm dirty.db; touch dirty.db` or `cat /dev/null > dirty.db`.
+docker-compose requires that the file exists, otherwise it will mount it as a folder.