Change apiversion of CRD from v1beta1 to v1

- Update CRDs (crd.yaml, crd-status-subresource.yaml) to match requirements of current release
	- Add `versions` field and structures `schema` as made mandatory in apiextensions/v1
	- Add annotation for api-approved.kubernetes.io since CRD is under *k8s.io domain
- Delete crd-validation.yaml since structured schema is mandatory in v1
- Update README

Signed-off-by: Madhav Jivrajani <madhav.jiv@gmail.com>

Kubernetes-commit: fd0ac9c8d169169c8072639970565cda9fb9499a

artifacts/examples/crd.yaml

@@ -1,10 +1,36 @@
-apiVersion: apiextensions.k8s.io/v1beta1
+apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   name: foos.samplecontroller.k8s.io
+  # for more information on the below annotation, please see
+  # https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/2337-k8s.io-group-protection/README.md
+  annotations:
+    "api-approved.kubernetes.io": "unapproved, experimental-only; please get an approval from Kubernetes API reviewers if you're trying to develop a CRD in the *.k8s.io or *.kubernetes.io groups"
 spec:
   group: samplecontroller.k8s.io
-  version: v1alpha1
+  versions:
+    - name: v1alpha1
+      served: true
+      storage: true
+      schema:
+        # schema used for validation
+        openAPIV3Schema:
+          type: object
+          properties:
+            spec:
+              type: object
+              properties:
+                deploymentName:
+                  type: string
+                replicas:
+                  type: integer
+                  minimum: 1
+                  maximum: 10
+            status:
+              type: object
+              properties:
+                availableReplicas:
+                  type: integer
   names:
     kind: Foo
     plural: foos