Setup webhook example structure

Signed-off-by: RainbowMango <qdurenhongcai@gmail.com>

examples/README.md

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+# Examples
+
+### Custom Resource Explorer
+This example implements a new CustomResourceDefinition(CRD), `Workload`, and creates a custom resource explorer webhook.

examples/customresourceexplorer/apis/workload/v1alpha1/workload_types.go

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+package v1alpha1
+
+import (
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// Workload is a simple Deployment.
+type Workload struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	// Spec represents the specification of the desired behavior.
+	// +required
+	Spec WorkloadSpec `json:"spec"`
+
+	// Status represents most recently observed status of the Workload.
+	// +optional
+	Status WorkloadStatus `json:"status,omitempty"`
+}
+
+// WorkloadSpec is the specification of the desired behavior of the Workload.
+type WorkloadSpec struct {
+	// Number of desired pods. This is a pointer to distinguish between explicit
+	// zero and not specified. Defaults to 1.
+	// +optional
+	Replicas *int32 `json:"replicas,omitempty"`
+
+	// Template describes the pods that will be created.
+	Template corev1.PodTemplateSpec `json:"template" protobuf:"bytes,3,opt,name=template"`
+
+	// Paused indicates that the deployment is paused.
+	// Note: both user and controllers might set this field.
+	// +optional
+	Paused bool `json:"paused,omitempty"`
+}
+
+// WorkloadStatus represents most recently observed status of the Workload.
+type WorkloadStatus struct {
+	// ReadyReplicas represents the total number of ready pods targeted by this Workload.
+	// +optional
+	ReadyReplicas int32 `json:"readyReplicas,omitempty"`
+}

examples/customresourceexplorer/webhook/main.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Printf("Place holder of the webhook.")
+}