docs: add rp examples (#192)

Author: jwtty

examples/resourceplacement/rp-cm.yaml

@@ -0,0 +1,21 @@
+# This tests selecting a single resource in a namespace,
+# and applying it to all clusters.
+# Prerequisite: create a configMap named "test-cm" in namespace "test-ns".
+apiVersion: placement.kubernetes-fleet.io/v1beta1
+kind: ResourcePlacement
+metadata:
+  name: rp-cm
+  namespace: test-ns
+spec:
+  resourceSelectors:
+    - group: ""
+      kind: ConfigMap
+      name: test-cm
+      version: v1
+  policy:
+    placementType: PickAll
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+      maxSurge: 1

examples/resourceplacement/rp-deploy.yaml

@@ -0,0 +1,26 @@
+# This tests selecting multiple resources in a namespace,
+# and only applying to a subset of clusters.
+# Prerequisite: create and expose a deployment named "test-nginx" in namespace "test-ns".
+apiVersion: placement.kubernetes-fleet.io/v1beta1
+kind: ResourcePlacement
+metadata:
+  name: rp-nginx
+  namespace: test-ns
+spec:
+  resourceSelectors:
+    - group: apps
+      kind: Deployment
+      name: test-nginx
+      version: v1
+    - group: ""
+      kind: Service
+      name: test-nginx
+      version: v1
+  policy:
+    placementType: PickN
+    numberOfClusters: 2
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+      maxSurge: 1

examples/resourceplacement/test-crp.yaml

@@ -0,0 +1,20 @@
+# This tests a CRP selecting a namespace only.
+# Prerequisite: create a namespace named "test-ns".
+apiVersion: placement.kubernetes-fleet.io/v1beta1
+kind: ClusterResourcePlacement
+metadata:
+  name: ns-only-crp
+spec:
+  resourceSelectors:
+    - group: ""
+      kind: Namespace
+      name: test-ns
+      version: v1
+      selectionScope: NamespaceOnly # only namespace itself is placed, no resources within the namespace
+  policy:
+    placementType: PickAll
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+      maxSurge: 1