Add ability to cache bookmark

lib/adamantium/page_cacher.rb

@@ -0,0 +1,12 @@
+require "readability"
+require "down"
+
+module Adamantium
+  class PageCacher
+    def call(url:, &block)
+      tempfile = Down.download(bookmark.url)
+      content = Readability::Document.new(tempfile.read, tags: %w[div section header p h1 h2 h3 h4 h5 h6 ol ul li table td tr thead tbody a code pre], attributes: %w[href]).content
+      yield content
+    end
+  end
+end