Quick add article to read later list .principle

First of all, the principle file attached, you can grab it here.

I have showed how to read later in article details http://drbl.in/pPHY, but in this news app we still need quickly add to read later list when we browse the news feed from friends.

It's first time to use a customed spring curve, hope you guys would like it, and press a "L" for me, haha.

Have a nice weekend.
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