Add README

README.md

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+# Docker-go-ssb-room
+
+Dockerfile for https://github.com/ssb-ngi-pointer/go-ssb-room/
+
+## Using
+
+Plain Docker:
+
+```sh
+docker run \
+	-e "DOMAIN=yourdomain.com" \
+	-v "$PWD/data:/app/data" \
+	-p "3000:3000" \
+	3wordchant/go-ssb-room:2.0.3
+```
+
+[Co-op Cloud](https://coopcloud.tech):
+
+```sh
+abra app new go-ssb-room
+# answer prompts
+abra app room.example.com deploy
+```