added video docs (#1859)

_docs/video-node.md

@@ -6,16 +6,82 @@ prevPage: map-node.html
 nextPage: scroll-node.html
 ---
 
-`ASVideoNode` is a newer class that exposes a relatively full-featured API, and is designed for both efficient and convenient implementation of embedded videos in scrolling views.
+`ASVideoNode` provides a convenient and performant way to display videos in your app.  
 
-Features:
-- supports autoplay (and pause) when items become visible, even if they are in a nested scroller (e.g. an ASPagerNode containing ASTableNodes). 
-- asynchronous downloading and decoding of a thumbnail / placeholder image if a URL is provided. If unavailable, it will use hardware frame decoding to display the first video frame. 
-- supports HLS (HTTP live streaming) - currently in PR form
+<div class = "note"><strong>Note:</strong> If you use ASVideoNode in your application, you must link AVFoundation since it uses AVPlayerLayer and other AVFoundation classes under the hood.</div>
 
-Gotchas:
-- Applications using ASVideoNode must link AVFoundation!
+### Basic Usage
+
+The easiest way to use ASVideoNode is to assign it an AVAsset.
+
+<div class = "highlight-group">
+<span class="language-toggle"><a data-lang="swift" class="swiftButton">Swift</a><a data-lang="objective-c" class = "active objcButton">Objective-C</a></span>
+
+<div class = "code">
+<pre lang="objc" class="objcCode">
+ASVideoNode *videoNode = [[ASVideoNode alloc] init];
+
+AVAsset *asset = [AVAsset assetWithURL:[NSURL URLWithString:@"http://www.w3schools.com/html/mov_bbb.mp4"]];
+videoNode.asset = asset;
+</pre>
+
+<pre lang="swift" class = "swiftCode hidden">
+let videoNode = ASVideoNode()
+
+let asset = AVAsset(URL: NSURL(string: "http://www.w3schools.com/html/mov_bbb.mp4"))
+videoNode.asset = asset
+</pre>
+</div>
+</div>
+
+### Autoplay, Autorepeat, and Muting
+
+You can configure the way your video node reacts to various events with a few simple BOOLs.
+
+If you'd like your video to automaticaly play when it enters the visible range, set the shouldAutoplay property to YES.  Setting shouldAutoRepeat to YES will cause the video to loop indefinitely, and, of course, setting muted to YES will turn the video's sound off.
+
+To set up a node that automatically plays once silently, you would just do the following.
+
+<div class = "highlight-group">
+<span class="language-toggle"><a data-lang="swift" class="swiftButton">Swift</a><a data-lang="objective-c" class = "active objcButton">Objective-C</a></span>
+
+<div class = "code">
+<pre lang="objc" class="objcCode">
+videoNode.shouldAutoplay = YES;
+videoNode.shouldAutorepeat = NO;
+videoNode.muted = YES;
+</pre>
+<pre lang="swift" class = "swiftCode hidden">
+videoNode.shouldAutoplay = true
+videoNode.shouldAutorepeat = false
+videoNode.muted = true
+</pre>
+</div>
+</div>
+
+### Placeholder Image
+
+Since video nodes inherit from ASNetworkImageNode, you can use the URL property to assign a placeholder image.  If you decide not to, the first frame of your video will automatically decoded and used as the placeholder instead.
+
+<img width = "300" src = "/static/video.gif"/>
+
+
+### ASVideoNode Delegate
+
+There are a ton of delegate methods available to you that allow you to react to what's happening with your video.  For example, if you want to react to the player's state changing, you can use:
+
+<div class = "highlight-group">
+<span class="language-toggle"><a data-lang="swift" class="swiftButton">Swift</a><a data-lang="objective-c" class = "active objcButton">Objective-C</a></span>
+
+<div class = "code">
+<pre lang="objc" class="objcCode">
+- (void)videoNode:(ASVideoNode *)videoNode willChangePlayerState:(ASVideoNodePlayerState)state toState:(ASVideoNodePlayerState)toState;
+</pre>
+<pre lang="swift" class = "swiftCode hidden">
+videoNode(videoNode:willChangePlayerState:toState:)
+</pre>
+</div>
+</div>
+
+The easiest way to see them all is to take a look at the `ASVideoNode` header file.
 
-Examples:
-- `examples/videoTableView`
-- `examples/videos`