Add more examples

docker/README.md

@@ -1,9 +1,36 @@
 # Official Docker Images
 
-The latest official Docker images are available on the [Docker Hub](https://hub.docker.com/u/roclang).
+The latest [official Docker images](https://hub.docker.com/u/roclang) are available on the Docker Hub.
 
-For example, if you run the following command in a terminal, Docker will pull the latest `nightly-ubuntu-2204` image from the Docker Hub and start an interactive container based on this image, running the `roc repl` command:
+For example, to pull the latest `nightly-ubuntu-2204` image from the Docker Hub, run the following command in a terminal (assuming you have already installed [Docker](https://docs.docker.com/engine/install/)):
+
+```bash
+docker pull roclang/nightly-ubuntu-2204
+```
+
+To start an interactive container based on this image, run:
+
+```bash
+docker run -it --rm roclang/nightly-ubuntu-2204
+```
+
+Note: the `--rm` option will delete the container when you exit. Remove this option is you want to keep the container instead.
+
+Inside the container, you can use the `roc` command directly, for example:
+
+```bash
+roc version
+roc repl
+```
+
+Alternatively, you can start a container and run a Roc REPL in one shot:
 
 ```bash
 docker run -it --rm roclang/nightly-ubuntu-2204 /usr/lib/roc/roc repl
 ```
+
+If you want to create you own Docker image based on this image, add the following in your `Dockerfile`:
+
+```Dockerfile
+FROM roclang/nightly-ubuntu-2204:latest
+```