add license header

Author: frederikbosch

src/lib.rs

@@ -1,3 +1,20 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF 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.
+
 use notify::{Config, RecommendedWatcher, RecursiveMode, Watcher, EventKind, event::*};
 use phper::{functions::Argument, modules::Module, php_get_module, values::ZVal, classes::{ClassEntity, ClassEntry, Visibility}};
 use phper::arrays::{ZArray, InsertKey, IterKey};