Initial implementation of kubevirt network with CRUD ops support

Change-Id: I6a366fcd301e67f62a74fb828eea1ac67f2a2128
diff --git a/apps/kubevirt-networking/api/src/main/java/org/onosproject/kubevirtnetworking/api/KubevirtNetworkService.java b/apps/kubevirt-networking/api/src/main/java/org/onosproject/kubevirtnetworking/api/KubevirtNetworkService.java
new file mode 100644
index 0000000..574f365
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+++ b/apps/kubevirt-networking/api/src/main/java/org/onosproject/kubevirtnetworking/api/KubevirtNetworkService.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2021-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.kubevirtnetworking.api;
+
+import org.onosproject.event.ListenerService;
+import org.onosproject.kubevirtnetworking.api.KubevirtNetwork.Type;
+
+import java.util.Set;
+
+/**
+ * Service for interacting with the inventory of kubevirt network.
+ */
+public interface KubevirtNetworkService
+        extends ListenerService<KubevirtNetworkEvent, KubevirtNetworkListener> {
+
+    /**
+     * Returns the kubevirt network with the supplied network identifier.
+     *
+     * @param networkId network identifier
+     * @return kubevirt network
+     */
+    KubevirtNetwork network(String networkId);
+
+    /**
+     * Returns all kubevirt networks registered in the service.
+     *
+     * @return set of kubevirt networks
+     */
+    Set<KubevirtNetwork> networks();
+
+    /**
+     * Returns the kubevirt networks with the given network type.
+     *
+     * @param type virtual network type
+     * @return set of kubevirt networks
+     */
+    Set<KubevirtNetwork> networks(Type type);
+}