Add README

README.md

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+# UniFi Controller Dockerfile
+
+This is a dockerised version of the Unifi Access Point (UAP) Controller.
+
+## Usage
+
+Create a named volume to persist data:
+
+```bash
+docker volume create --name unifi-data
+```
+
+Pull the image for the desired version of the controller:
+
+```bash
+docker pull csmith/unifi:4.8.18
+```
+
+Start a container, exposing ports as needed:
+
+```bash
+docker run -d --name unifi \
+              --restart always \
+              -p 8443:8443 \
+              -p 8080:8080 \
+              -v unifi-data:/var/lib/unifi \
+              csmith/unifi:4.8.18
+```
+
+Port 8443 is used for the HTTPS web interface, port 8080 used by APs.
+
+The Dockerfile exposes these ports: 8081 8443 8843 8880