separate unittest folder

unittests/CatchRunner.h

@@ -0,0 +1,14 @@
+#ifndef FSFW_TESTS_USER_UNITTEST_CORE_CATCHRUNNER_H_
+#define FSFW_TESTS_USER_UNITTEST_CORE_CATCHRUNNER_H_
+
+namespace fsfwtest {
+
+/**
+ * Can be called by upper level main() if default Catch2 main is overriden
+ * @return
+ */
+// int customMain(int argc, char* argv[]);
+
+}  // namespace fsfwtest
+
+#endif /* FSFW_TESTS_USER_UNITTEST_CORE_CATCHRUNNER_H_ */