Add Sample Apps for Animated Gradient Visual

Add Sample Apps for Animated Gradient Visual

Add two sample apps which using animated gradient visual
(doing at review.tizen.org/gerrit/#/c/152141/ )
It's resolution is optimized for wearable (resolution is 360x360)

 - Call Active
  Scenario is incomming call.
  Show incomming gradient effect as radial form animated gradient.
  And add some animation at call_decline button so make user want to touch it!
  This sample show how to make animated gradient by json script.
 - Card Active
  Scenario is use some coupon with NFC tag.
  Show gradient effect during NFC taging is enabled.
  This sample show how to make anmiated gradient by inline code.

Change-Id: Ifae6698fbf1b4bc9901efa929594261413d450b2
Signed-off-by: Eunki Hong <eunkiki.hong@samsung.com>