Update README for Docker

docker/README.md

@@ -7,6 +7,40 @@ This Docker image is designed to provide the following
 * An image that can be deployed as a full cluster by mounting in configuration
 * An image to be used as the basis for the Kubernetes Presto operator
 
+## Quickstart
+
+### Run the Presto server
+
+You can launch a single node Presto cluster for testing purposes.
+The Presto node will function both as a coordinator and a worker.
+To launch it, execute the following:
+
+```bash
+docker run -p 8080:8080 --name presto prestosql/presto
+```
+
+Wait for the following message log line:
+```
+INFO	main	io.prestosql.server.PrestoServer	======== SERVER STARTED ========
+```
+
+The Presto server is now running on `localhost:8080` (the default port).
+
+### Run the Presto CLI
+
+Run the [Presto CLI](https://prestosql.io/docs/current/installation/cli.html),
+which connects to `localhost:8080` by default:
+
+```bash
+docker exec -it presto presto
+```
+
+You can pass additional arguments to the Presto CLI:
+
+```bash
+docker exec -it presto presto --catalog tpch --schema sf1
+```
+
 ## Configuration
 
 Configuration is expected to be mounted to either  to `/etc/presto` or
@@ -26,3 +60,21 @@ across all worker nodes if desired. Additionally this has the added benefit of
 The default configuration uses `/data/presto` as the default for
 `node.data-dir`. Thus if using the default configuration and a mounted volume
 is desired for the data directory it should be mounted to `/data/presto`.
+
+## Building a custom Docker image
+
+To build an image for a locally modified version of Presto, run the Maven
+build as normal for the `presto-server` and `presto-cli` modules, then
+build the image:
+
+```bash
+./build-local.sh
+```
+
+The Docker build process will print the ID of the image, which will also
+be tagged with `presto:xxx-SNAPSHOT`, where `xxx-SNAPSHOT` is the version
+number of the Presto Maven build.
+
+## Getting Help
+
+Join the Presto community [Slack](https://prestosql.io/slack.html).