Navigate to the Pinned events timeline (#3139)

ElementX/Sources/Screens/PinnedEventsTimelineScreen/PinnedEventsTimelineScreenModels.swift

@@ -0,0 +1,32 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+enum PinnedEventsTimelineScreenViewModelAction {
+    case dismiss
+}
+
+struct PinnedEventsTimelineScreenViewState: BindableState {
+    var title: String {
+        // TODO: Implement the non empty case
+        L10n.screenPinnedTimelineScreenTitleEmpty
+    }
+}
+
+enum PinnedEventsTimelineScreenViewAction {
+    case close
+}