Subscribed channels cache

Model/Cache/BookmarksCacheModel.swift

@@ -0,0 +1,17 @@
+import Cache
+import Foundation
+import Logging
+import SwiftyJSON
+
+struct BookmarksCacheModel {
+    static var shared = BookmarksCacheModel()
+    let logger = Logger(label: "stream.yattee.cache")
+
+    static let bookmarksGroup = "group.stream.yattee.app.bookmarks"
+    let defaults = UserDefaults(suiteName: Self.bookmarksGroup)
+
+    func clear() {
+        guard let defaults else { return }
+        defaults.dictionaryRepresentation().keys.forEach(defaults.removeObject(forKey:))
+    }
+}