Add missing copyrights. (#67)

Signed-off-by: parvy <pierre.arvy@artelys.com>

open-reac/src/test/java/com/powsybl/openreac/OpenReacResultsTest.java

@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) 2024, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
 package com.powsybl.openreac;
 
 import com.powsybl.commons.report.ReportNode;

open-reac/src/test/java/com/powsybl/openreac/parameters/output/OpenReacNetworkOutputTest.java

@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) 2024, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
 package com.powsybl.openreac.parameters.output;
 
 import com.powsybl.openreac.exceptions.IncompatibleModelException;

open-reac/src/test/java/com/powsybl/openreac/parameters/output/VoltageProfileOutputTest.java

@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) 2024, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
 package com.powsybl.openreac.parameters.output;
 
 import org.jgrapht.alg.util.Pair;