Add meeting object

src/main/java/com/eternalcode/discordapp/meeting/Meeting.java

@@ -0,0 +1,17 @@
+package com.eternalcode.discordapp.meeting;
+
+import java.time.Instant;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Meeting {
+
+    private Instant issuedAt;
+    private final Set<Long> presentMembers = new HashSet<>();
+    private final Set<Long> absentMembers = new HashSet<>();
+
+    void addPresentMemeber(long id) {
+        this.presentMembers.add(id);
+    }
+
+}

src/main/java/com/eternalcode/discordapp/meeting/MeetingUser.java

@@ -6,7 +6,7 @@
 @Contextual
 public class MeetingUser {
 
-    private Long discordId;
+    private long discordId;
     private MeetingNotificationType notificationType;
     private Boolean isPresent;