Add SiriShortcuts technote

Technotes/SiriShortcuts.markdown

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+# Siri Shortcuts on iOS
+
+As you use NetNewsWire on iOS we donate Siri Shortcuts to the system.  These shortcuts 
+can be used by Siri for shortcut prediction on the lock screen and the search screen.  They
+can also be used in the Shortcuts app that is included in iOS.
+
+For example if you visit the Starred smart, you will see a shortcut for it available in the 
+Shortcuts app for you to assign a launch trigger for or to script.
+
+#### Timeline Shortcuts
+
+- See articles for “Today”
+- See articles in “All Unread”
+- See articles in “Starred”
+- See articles in  “Folder” (where folder is the name of a folder you have selected)
+
+#### Action Shortcuts
+
+- See first unread article
+
+If you have a request for a shortcut you would like included in NetNewsWire,
+please file it as a feature request in Github Issues.