[doc] Add pipectl init

docs/content/en/docs-dev/feature-status/_index.md

@@ -130,3 +130,13 @@ Please note that the phases (Incubating, Alpha, Beta, and Stable) are applied to
 | [Insights](../user-guide/insights/) - Show the delivery performance of a team or an application | Incubating |
 | [Deployment Chain](../user-guide/managing-application/deployment-chain/) - Allow rolling out to multiple clusters gradually or promoting across environments | Alpha |
 | [Metrics](../user-guide/managing-controlplane/metrics/) - Dashboards for PipeCD and Piped metrics | Beta |
+
+## [pipectl](../user-guide/command-line-tool/)
+
+### [pipectl init](../user-guide/command-line-tool.md#generating-an-application-config-apppipecdyaml)
+
+| Feature | Phase |
+|-|-|
+| Kubernetes - QuickSync | Incubating |
+| ECS - QuickSync | Alpha |
+| ECS - Pipeline Sync | Incubating |

docs/content/en/docs-dev/user-guide/command-line-tool.md

@@ -104,6 +104,7 @@ Available Commands:
   encrypt      Encrypt the plaintext entered in either stdin or the --input-file flag.
   event        Manage event resources.
   help         Help about any command
+  init         Generate an application config (app.pipecd.yaml) easily and interactively.
   piped        Manage piped resources.
   plan-preview Show plan preview against the specified commit.
   quickstart   Quick prepare PipeCD control plane in quickstart mode.
@@ -311,6 +312,38 @@ You can encrypt it the same way you do [from the web](../managing-application/se
 
 Note: The docs for pipectl available command is maybe outdated, we suggest users use the `help` command for the updated usage while using pipectl.
 
+### Generating an application config (app.pipecd.yaml)
+
+
+Generate an app.pipecd.yaml interactively:
+
+``` console
+$ pipectl init 
+Which platform? Enter the number [0]Kubernetes [1]ECS: 1
+Name of the application: myApp
+...
+```
+
+After the above interaction, you can get the config YAML:
+
+```yaml
+apiVersion: pipecd.dev/v1beta1
+kind: ECSApp
+spec:
+  name: myApp
+  input:
+    serviceDefinitionFile: serviceDef.yaml
+    taskDefinitionFile: taskDef.yaml
+    targetGroups:
+      primary:
+        targetGroupArn: arn:aws:elasticloadbalancing:ap-northeast-1:123456789012:targetgroup/xxx/xxx
+        containerName: web
+        containerPort: 80
+  description: Generated by `pipectl init`. See https://pipecd.dev/docs/user-guide/configuration-reference/ for more.
+```
+
+See [Feature Status](../feature-status/_index.md#pipectl-init).
+
 ### You want more?
 
 We always want to add more needed commands into pipectl. Please let us know what command you want to add by creating issues in the [pipe-cd/pipecd](https://github.com/pipe-cd/pipecd/issues) repository. We also welcome your pull request to add the command.

pkg/app/pipectl/cmd/initialize/initialize.go

@@ -51,9 +51,9 @@ func NewCommand() *cobra.Command {
 	c := &command{}
 	cmd := &cobra.Command{
 		Use:     "init",
-		Short:   "Generate a app.pipecd.yaml easily and interactively",
+		Short:   "Generate an application config (app.pipecd.yaml) easily and interactively.",
 		Example: `  pipectl init`,
-		Long:    "Generate a app.pipecd.yaml easily, interactively selecting options.",
+		Long:    "Generate an application config (app.pipecd.yaml) easily, interactively selecting options.",
 		RunE:    cli.WithContext(c.run),
 	}