Add REST API for 'create project'

Change-Id: Ifbeb2b02ece00bf7210cb21bdd41a26d2e10450d

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/restapi/UnprocessableEntityException.java

@@ -0,0 +1,24 @@
+// Copyright (C) 2013 The Android Open Source Project
+//
+// 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 com.google.gerrit.extensions.restapi;
+
+/** Resource referenced in the request body is not found (HTTP 422 Unprocessable Entity). */
+public class UnprocessableEntityException extends RestApiException {
+  private static final long serialVersionUID = 1L;
+
+  public UnprocessableEntityException(String msg)  {
+    super(msg);
+  }
+}