add license

Signed-off-by: Stefan Niederhauser <[email protected]>

Author: nidi3

graphviz-java/src/test/java/guru/nidi/graphviz/engine/StringFunctionsTest.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright © 2015 Stefan Niederhauser ([email protected])
+ *
+ * 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 guru.nidi.graphviz.engine;
 
 import org.junit.jupiter.api.Test;