Created Installing on Docker (markdown)

Installing-on-Docker.md

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+# Installing on Docker
+
+There is a `Dockerfile` at the root of this repository which you can use to build your own Docker image. There is not an officially published Docker image from this file though. However, there is a third party automatically built and published Docker image on Docker Hub at https://hub.docker.com/r/grepular/radicale. This image is built automatically once a day if a new version of Radicale has been released, by an automated workflow at this Gitlab repository https://gitlab.com/grepular/docker-radicale. For a given `major.minor.patch` version release, the following Docker tags are published:
+
+- latest
+- major.minor.patch
+- major.minor
+- major
+
+## Trust
+
+The person behind this auto-built image is - https://www.grepular.com / https://github.com/mikecardwell / https://gitlab.com/mikecardwell and it's origin is this discussion - https://github.com/Kozea/Radicale/discussions/1745
+
+## Example run using docker command
+
+```
+docker run \
+    -p 127.0.0.1:5232:5232 \
+    -v "$PWD/config:/etc/radicale" \
+    -v "$PWD/data:/var/lib/radicale" \
+    grepular/radicale:3
+```
+
+Now you should be able to access it at http://127.0.0.1:5232
+
+## Example docker-compose.yml file
+
+```
+---
+version: "2.1"
+services:
+  radicale:
+    image: grepular/radicale:3
+    user: root
+    ports:
+      - "5232:5232"
+    volumes:
+      - /opt/radicale/config:/etc/radicale:ro
+      - /opt/radicale/data:/var/lib/radicale
+    restart: unless-stopped
+```
+
+If you wish to build the image locally as part of your docker-compose configuration, you can replace the "image" entry with a "build" entry linking to the official repository:
+
+```
+---
+version: "2.1"
+services:
+  radicale:
+    build: github.com/Kozea/Radicale#v3.5.2
+    user: root
+    ports:
+      - "5232:5232"
+    volumes:
+      - /opt/radicale/config:/etc/radicale:ro
+      - /opt/radicale/data:/var/lib/radicale
+    restart: unless-stopped
+```