Add another ExpandableLayout lib into Layout section (#263)

* Add ExpandableLayout by skydoves in README.md

Because there is another ExpandableLayout lib with the same name that has already been listed so I had to add postfix "by skydoves" (author's Github name) for this one's name.

* Add ExpandableLayout by skydoves in pages/layout

* add GIFs for Expandable Layout by skydoves
Co-authored-by: NBravo <Huynh.Tinh@legato.co>
Co-authored-by: NPierrick Greze <pierrick.greze@gmail.com>

README.md

@@ -368,13 +368,11 @@ Name | License | Demo
 [ExplosionField](https://github.com/tyrantgit/ExplosionField) | [Apache License V2](https://www.apache.org/licenses/LICENSE-2.0) | <img src="/art/ExplosionField.gif" width="49%">
 [BrokenView](https://github.com/zhanyongsheng/BrokenView) | [MIT](https://opensource.org/licenses/MIT) | <img src="/art/BrokenView.gif" width="49%">
 [Trianglify](https://github.com/manolovn/trianglify) | [Apache License V2](https://www.apache.org/licenses/LICENSE-2.0) | <img src="/art/Trianglify.png" width="49%">
-[Expandable Layout](https://github.com/skydoves/ExpandableLayout) | [Apache License V2](https://www.apache.org/licenses/LICENSE-2.0) | <img src="https://user-images.githubusercontent.com/24237865/67871178-4b9e7f00-fb73-11e9-9f93-fef72b2d627d.gif" align="center" width="32%"/>
-[ShineButton](https://github.com/ChadCSong/ShineButton) | [MIT](https://opensource.org/licenses/MIT) | <img src="/art/ShineButton.gif" width="100%">
+[ExpandableLayout (by skydoves)](https://github.com/skydoves/ExpandableLayout) | [Apache License V2](https://www.apache.org/licenses/LICENSE-2.0) | <img src="/art/ExpandableLayout2_1.gif" width="49%"> <img src="/art/ExpandableLayout2_2.gif" width="49%">[ShineButton](https://github.com/ChadCSong/ShineButton) | [MIT](https://opensource.org/licenses/MIT) | <img src="/art/ShineButton.gif" width="100%">
 [Elastic Views](https://github.com/skydoves/ElasticViews) | [MIT](https://opensource.org/licenses/MIT) | <img src="https://user-images.githubusercontent.com/24237865/72123075-73943500-33a3-11ea-883f-9009de998788.gif" width="32%">
 [Transformation Layout](https://github.com/skydoves/TransformationLayout) | [Apache License V2](https://www.apache.org/licenses/LICENSE-2.0) | <img src="art/TransformationLayout.gif" width="32%">
 
 
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 Other
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 Name | License | Demo