Add NotificationSettings and Keywords UI and VM

Riot/Modules/Settings/Notifications/SwiftUI/Keywords.swift

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+// 
+// Copyright 2021 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 SwiftUI
+
+@available(iOS 14.0, *)
+struct Keywords: View {
+    
+    @ObservedObject var viewModel: KeywordsViewModel
+    @State var keywordText: String = ""
+    
+    var body: some View {
+        VStack {
+            TextField("New Keyword", text: $keywordText)
+            Chips(chips: viewModel.keywords)
+        }
+    }
+}
+
+@available(iOS 14.0, *)
+struct Keywords_Previews: PreviewProvider {
+    static var previews: some View {
+        Keywords(viewModel: KeywordsViewModel())
+    }
+}