ONOS-5755: RESTCONF App: App Skeleton creation

pom file will stay the same as before, while testing, please add <module>restconf</module> at apps/pom.xml

modified by Henry's comments.

Change-Id: I55d6bd4de07f03dcad77dfa575cb54c5563c937c
diff --git a/apps/restconf/api/src/main/java/org/onosproject/restconf/api/package-info.java b/apps/restconf/api/src/main/java/org/onosproject/restconf/api/package-info.java
new file mode 100644
index 0000000..273e398
--- /dev/null
+++ b/apps/restconf/api/src/main/java/org/onosproject/restconf/api/package-info.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.
+ */
+
+/**
+ * RESTCONF Server Public Interface. All public interfaces/APIs that might be used by
+ * external applications should be packaged here.
+ */
+package org.onosproject.restconf.api;