Added documentation for opc task.

README.md

@@ -3,3 +3,6 @@
 This repository provides various task related to OpenShift and OpenShift Pipelines.
 - [openshift-client](docs/task-openshift-client.md)
 - [tkn](docs/task-tkn.md)
+- [opc](docs/task-opc.md)
+- [kn](docs/task-kn.md)
+- [kn-apply](docs/task-kn-apply.md)

docs/task-opc.md

@@ -0,0 +1,56 @@
+`opc` Tekton Task
+-----------------------
+
+# Abstract
+
+The `opc` Task makes it easy to work with Tekton resources in OpenShift Pipelines.
+
+# Usage
+
+Please, consider the usage example below:
+
+```yaml
+---
+apiVersion: tekton.dev/v1
+kind: PipelineRun
+metadata: {}
+spec:
+  pipelineRef:
+    name: task-opc
+  params:
+    - name: SCRIPT
+      value: "opc $@"
+    - name: ARGS
+      value: opc-command-you-want-to-execute
+
+```
+You'll need to replace `opc-command-you-want-to-execute`  with opc CLI arguments based on what operation you want to perform with the Tekton resources in OpenShift Pipelines.
+In case the Container Registry requires authentication, please consider the [Tekton Pipelines documentation][tektonPipelineAuth]. In a nutshell, you need to create a Kubernetes Secret describing the following attributes:
+
+```bash
+kubectl create secret docker-registry imagestreams \
+  --docker-server="image-registry.openshift-image-registry.svc:5000" \
+  --docker-username="${REGISTRY_USERNAME}" \
+  --docker-password="${REGISTRY_TOKEN}"
+```
+
+Then make sure the Secret is linked with the Service-Account running the `TaskRun`/`PipelineRun`.
+
+## Workspace
+
+| Name         | Optional                      | Description                      |
+| :------------ | :------------------------: | :--------------------------- |
+| `kubeconfig_dir` | `true` | An optional workspace that allows you to provide a .kube/config file for opc to access the cluster. |
+
+
+## Params
+
+| Param         | Type                       | Default                      | Description                |
+| :------------ | :------------------------: | :--------------------------- | :------------------------- |
+| `SCRIPT` | `string` | (required) | opc CLI script to execute |
+| `ARGS` | `array` | (required) | opc CLI arguments to run |
+
+
+
+[tektonPipelineAuth]: https://tekton.dev/docs/pipelines/auth/#configuring-docker-authentication-for-docker
+