add draft classes for protocol management

src/main/java/de/ul/swtp/modules/protocolmanagement/Protocol.java

@@ -0,0 +1,17 @@
+package de.ul.swtp.modules.protocolmanagement;
+
+import de.ul.swtp.modules.contactmanagement.Contact;
+
+import java.security.Signature;
+import java.sql.Timestamp;
+import java.util.List;
+
+public class Protocol {
+    private List<Contact> presentMembers;
+    private List<Contact> authors;
+    private List<ProtocolEntry> entries;
+    private Boolean isLocked;
+    private Timestamp protocolDate;
+    private Signature
+
+}