chore: add copyright headers

Make sure we obey the REUSE (https://reuse.software) specification and the
origin, copyright owner, and license of all files are clearly marked.

The whole project is under the EPL-2.0, except for trivial files where copyright
is not applicable that are marked with the CC0-1.0 license. Moreover, code
included from third parties is also available under the respective license.

chore: add CONTRIBUTORS.md

List all authors and supporting organizations in accordance with the REUSE
specification.

3 files changed, 15 insertions, 0 deletions

diff --git a/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfBuilderTest.java b/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfBuilderTest.java
index ceb46d6f..70cd386b 100644
--- a/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfBuilderTest.java
+++ b/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfBuilderTest.java
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
 package tools.refinery.store.query;
 
 import org.junit.jupiter.api.Test;
diff --git a/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfToDefinitionStringTest.java b/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfToDefinitionStringTest.java
index 9b469bb0..7be57745 100644
--- a/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfToDefinitionStringTest.java
+++ b/subprojects/store-query/src/test/java/tools/refinery/store/query/DnfToDefinitionStringTest.java
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
 package tools.refinery.store.query;
 
 import org.junit.jupiter.api.Test;
diff --git a/subprojects/store-query/src/test/java/tools/refinery/store/query/tests/StructurallyEqualToTest.java b/subprojects/store-query/src/test/java/tools/refinery/store/query/tests/StructurallyEqualToTest.java
index a61e2b65..e292b3ab 100644
--- a/subprojects/store-query/src/test/java/tools/refinery/store/query/tests/StructurallyEqualToTest.java
+++ b/subprojects/store-query/src/test/java/tools/refinery/store/query/tests/StructurallyEqualToTest.java
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
 package tools.refinery.store.query.tests;
 
 import org.junit.jupiter.api.Test;