Create groups an channels

src/main/java/org/to/telegramfinalproject/Server/GroupService.java

@@ -0,0 +1,23 @@
+package org.to.telegramfinalproject.Server;
+
+import org.to.telegramfinalproject.Models.Group;
+import org.to.telegramfinalproject.Database.GroupDatabase;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+public class GroupService {
+    public static boolean createGroup(String groupId, String groupName, UUID creatorUUID, String imageUrl) {
+        UUID internalUUID = UUID.randomUUID();
+        LocalDateTime now = LocalDateTime.now();
+
+        boolean inserted = GroupDatabase.insertGroup(internalUUID, groupId, groupName, creatorUUID, imageUrl, now);
+
+        if (inserted) {
+            GroupDatabase.addMember(internalUUID, creatorUUID, "owner"); // سازنده owner می‌شود
+            return true;
+        }
+        return false;
+    }
+
+}