Add system button

App/CompactViewController.swift

@@ -145,6 +145,8 @@ private struct CompactView: View {
                             Spacer()
                             BookmarkButton()
                             Spacer()
+                            ShareButton()
+                            Spacer()
                             TabsManagerButton()
                             if FeatureFlags.hasLibrary {
                                 Spacer()

Views/BrowserTab.swift

@@ -37,6 +37,7 @@ struct BrowserTab: View {
             #endif
             ToolbarItemGroup(placement: .primaryAction) {
                 OutlineButton()
+                ShareButton()
                 BookmarkButton()
                 ArticleShortcutButtons(displayMode: .mainAndRandomArticle)
             }

Views/Buttons/ShareButton.swift

@@ -0,0 +1,33 @@
+// This file is part of Kiwix for iOS & macOS.
+//
+// Kiwix is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// any later version.
+//
+// Kiwix is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Kiwix; If not, see https://www.gnu.org/licenses/.
+
+import SwiftUI
+
+struct ShareButton: View {
+
+    @EnvironmentObject private var browser: BrowserViewModel
+
+    var body: some View {
+        Button {
+            debugPrint("share this")
+        } label: {
+            Label {
+                Text("Share".localized)
+            }  icon: {
+                Image(systemName: "square.and.arrow.up")
+            }
+        }.disabled(browser.zimFileName.isEmpty)
+    }
+}