started adding logging to FileIO

app/src/test/java/ch/zhaw/projekt2/turnierverwaltung/FileIOTest.java

@@ -12,6 +12,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Comparator;
 import java.util.List;
+import java.util.logging.Logger;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -107,7 +108,7 @@ class FileIOTest {
         }
 
         @Test
-        void saveTournament() {
+        void saveTournament() throws IOException {
             Tournament tournament = new Tournament("test1");
             io.saveTournament(tournament);
             File file = new File(mainDir + "\\saves\\test1.txt");