Initial implementation of the JoinRoomScreen. (#2684)

* Update Compound and use super button for room directory.

ElementX/Sources/Screens/JoinRoomScreen/JoinRoomScreenViewModelProtocol.swift

@@ -0,0 +1,23 @@
+//
+// 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 Combine
+
+@MainActor
+protocol JoinRoomScreenViewModelProtocol {
+    var actionsPublisher: AnyPublisher<JoinRoomScreenViewModelAction, Never> { get }
+    var context: JoinRoomScreenViewModelType.Context { get }
+}