Add initial amp-jwplayer sample (#361)
Add initial amp-jwplayer sample (#361)

* Add initial amp-jwplayer sample

* Update amp-jwplayer tags

ampproject/amp-by-example,ampproject/amp-by-example,ampproject/amp-by-example,camelburrito/amp-by-example,ampproject/amp-by-example,camelburrito/amp-by-example,camelburrito/amp-by-example,camelburrito/amp-by-example