docs: add readme (#9)

refactor: add proper usage string to cli

README.md

@@ -1 +1,57 @@
-# kubectl-mapr-ticket
+# kubectl-mapr-ticket
+
+`kubectl-mapr-ticket` is a `kubectl` plugin that allows you to list and inspect MapR tickets deployed as Kubernetes secrets in a cluster.
+
+MapR tickets are used by the [MapR CSI driver](https://github.com/mapr/mapr-csi) to authenticate and authorize access to Persistent Volumes backed by MapR storage.
+
+## Installation
+
+### From Source
+
+To install from source, you will need to have [Go](https://golang.org/) installed on your system. Once you have Go installed, you can build the plugin as follows:
+
+```console
+$ git clone https://github.com/nobbs/kubectl-mapr-ticket.git
+$ cd kubectl-mapr-ticket && CGO_ENABLED=0 go build -buildvcs=true -o ./bin/kubectl-mapr-ticket ./cmd && mv ./bin/kubectl-mapr-ticket /usr/local/bin
+$ kubectl mapr-ticket --help
+```
+
+### Using Release Binaries
+
+You can download the latest release binaries from the [releases page](https://github.com/nobbs/kubectl-mapr-ticket/releases). Binaries are available for Linux and macOS for both AMD64 and ARM64 architectures.
+
+<!-- x-release-please-start-version -->
+Example installation of `v0.1.0` for Apple Silicon (ARM64) macOS:
+
+```console
+$ curl -LO https://github.com/nobbs/kubectl-mapr-ticket/releases/download/v0.1.0/kubectl-mapr-ticket-arm64-darwin.tar.gz
+$ tar -xvf kubectl-mapr-ticket-arm64-darwin.tar.gz
+$ mv ./kubectl-mapr-ticket /usr/local/bin
+$ kubectl mapr-ticket --help
+```
+<!-- x-release-please-end -->
+
+## Usage
+
+Currently, `kubectl-mapr-ticket` supports only the `list` command. This command will list all MapR tickets deployed in the current namespace. The output will include the name of the secret, the MapR cluster name, the username, and the expiry date of the ticket.
+
+```console
+$ kubectl mapr-ticket list
+NAME                      MAPR CLUSTER         USER     EXPIRATION
+mapr-dev-ticket-user-a    demo.dev.mapr.com    user_a   2028-11-09T15:50:57+01:00 (Expired)
+mapr-dev-ticket-user-b    demo.dev.mapr.com    user_b   2028-11-09T15:50:55+01:00 (Expired)
+mapr-dev-ticket-user-c    demo.dev.mapr.com    user_c   2028-11-09T15:50:51+01:00 (Expired)
+mapr-prod-ticket-user-a   demo.prod.mapr.com   user_a   2023-11-19T08:47:05+01:00
+mapr-prod-ticket-user-b   demo.prod.mapr.com   user_b   2023-11-19T08:47:03+01:00
+mapr-prod-ticket-user-c   demo.prod.mapr.com   user_c   2023-11-19T08:47:02+01:00
+```
+
+## Does this require a connection to a MapR cluster?
+
+**No, this `kubectl` plugin does not require a connection to a MapR cluster.** The plugin will inspect the secrets in the current namespace, filter them down to those that are MapR tickets, and then decode the ticket contents using [this reverse-engineered ticket parser](https://github.com/nobbs/mapr-ticket-parser) which is based on this [blog post of mine](https://nobbs.dev/posts/reverse-engineering-mapr-ticket-format/).
+
+Based on testing, the plugin is able to parse tickets starting at least from MapR 6.0.0 as the format did not receive any breaking changes since then.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

cmd/cli/root.go

@@ -22,8 +22,10 @@ func NewRootCmd(streams genericclioptions.IOStreams) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "kubectl-mapr-ticket",
-		Short: "A brief description of your application",
-		Long:  `A longer description that spans multiple lines and likely contains examples and usage of using your application.`,
+		Short: "A kubectl plugin to list and inspect MapR tickets",
+		Long: `A kubectl plugin that allows you to list and inspect MapR tickets from a
+Kubernetes cluster, including details stored in the ticket itself without
+requiring access to the MapR cluster.`,
 	}
 
 	// set IOStreams for the command