first commit

Core/Entities/PartialTeam.cs

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+namespace Core.Entities;
+
+public class PartialTeam : Team
+{
+	public IList<Student> OmittedStudents { get; }
+
+	public PartialTeam(string name, CompetitiveEvent @event, IList<Student> students, IList<Student> omittedStudents) : base(name, @event, students)
+	{
+		OmittedStudents = omittedStudents;
+	}
+
+	public override Team CloneWithOmittedStudents(IEnumerable<Student> studentsToOmit)
+	{
+		var remainingStudents = Students.Where(s => !studentsToOmit.Contains(s)).ToList();
+		var omittedStudents = OmittedStudents.Union(Students.Where(studentsToOmit.Contains)).Distinct().ToList();
+		return new PartialTeam(Name, Event, remainingStudents, omittedStudents );
+	}
+}