Add doc for vpc image list cmd (#1101)

docs/book/src/SUMMARY.md

@@ -22,6 +22,8 @@
     - [Network Commands](./topics/capibmadm/powervs/network.md)
     - [Port Commands](./topics/capibmadm/powervs/port.md)
     - [SSH key Commands](./topics/capibmadm/powervs/key.md)
+  - [VPC Commands](./topics/capibmadm/vpc/index.md)
+    - [Image Commands](./topics/capibmadm/vpc/image.md)
 - [Developer Guide](./developer/index.md)
   - [Rapid iterative development with Tilt](./developer/tilt.md)
   - [Guide for API conversions](./developer/conversion.md)

docs/book/src/topics/capibmadm/index.md

@@ -3,3 +3,4 @@
 Kubernetes Cluster API Provider IBM Cloud Management Utility
 
 ## [1. Power VS commands](./powervs/index.md)
+## [2. VPC commands](./vpc/index.md)

docs/book/src/topics/capibmadm/vpc/image.md

@@ -0,0 +1,20 @@
+## PowerVS VPC Commands
+
+### 1. capibmadm vpc image list
+
+#### Usage:
+List images in given VPC region.
+
+#### Environmental Variable:
+IBMCLOUD_API_KEY: IBM Cloud API key.
+
+#### Arguments:
+--region: VPC region.
+
+--resource-group-name: IBM Cloud resource group name.
+
+#### Example:
+```shell
+export IBMCLOUD_API_KEY=<api-key>
+capibmadm vpc image list --region <region> --resource-group-name <resource-group>
+```

docs/book/src/topics/capibmadm/vpc/index.md

@@ -0,0 +1,6 @@
+# capibmadm vpc `<commands>`
+
+
+## 1. VPC commands
+- [image](./image.md)
+    - [list](/topics/capibmadm/vpc/image.html#1-capibmadm-vpc-image-list)