init csv support

src/main/java/mops/gruppen2/service/CsvService.java

@@ -0,0 +1,22 @@
+package mops.gruppen2.service;
+
+import com.fasterxml.jackson.databind.ObjectReader;
+import com.fasterxml.jackson.dataformat.csv.CsvMapper;
+import com.fasterxml.jackson.dataformat.csv.CsvSchema;
+import mops.gruppen2.domain.User;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+public class CsvService {
+
+    public static List<User> read(InputStream stream) throws IOException {
+        CsvMapper mapper = new CsvMapper();
+
+        CsvSchema schema = mapper.schemaFor(User.class).withHeader().withColumnReordering(true);
+        ObjectReader reader = mapper.readerFor(User.class).with(schema);
+
+        return reader.<User>readValues(stream).readAll();
+    }
+}