Add share link in start chat flow (#926)

ElementX/Sources/Other/SwiftUI/Views/MatrixUserShareLink.swift

@@ -0,0 +1,43 @@
+//
+// Copyright 2023 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
+
+struct MatrixUserShareLink<Label: View>: View {
+    private let permalink: URL?
+    private let label: Label
+    
+    init(userID: String, @ViewBuilder label: () -> Label) {
+        self.label = label()
+        permalink = try? PermalinkBuilder.permalinkTo(userIdentifier: userID)
+    }
+    
+    var body: some View {
+        if let permalink {
+            ShareLink(item: L10n.inviteFriendsText(InfoPlistReader.main.bundleDisplayName, permalink.absoluteString)) {
+                label
+            }
+        }
+    }
+}
+
+struct MatrixUserPermalink_Previews: PreviewProvider {
+    static var previews: some View {
+        MatrixUserShareLink(userID: "@someone:somewhere.org") {
+            Label("Share", systemImage: "square.and.arrow.up")
+        }
+    }
+}