Missing files + start working on offline patcher

SafeExamBrowser.Core.Contracts/ResponsibilityModel/IResponsibility.cs

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+namespace SafeExamBrowser.Core.Contracts.ResponsibilityModel
+{
+	/// <summary>
+	/// Defines a responsibility which will be executed as part of an <see cref="IResponsibilityCollection{T}"/>.
+	/// </summary>
+	public interface IResponsibility<T>
+	{
+		/// <summary>
+		/// Assumes the given task.
+		/// </summary>
+		void Assume(T task);
+	}
+}