Add missing file for checkstyle plugin fix

src/main/java/org/jboss/netty/util/internal/jzlib/package-info.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2011 The Netty Project
+ *
+ * The Netty Project licenses this file to you 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.
+ */
+
+/**
+ * <em>Internal-use-only</em> utilities which is not allowed to be used
+ * outside Netty.
+ */
+package org.jboss.netty.util.internal.jzlib;