Adds video intelligence sample instructions. (#320)

* Adds video intelligence sample instructions.

* Update README.md

* Update command-line instructions to match sample

video/README.md

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+<img src="https://avatars2.githubusercontent.com/u/2810941?v=3&s=96" alt="Google Cloud Platform logo" title="Google Cloud Platform" align="right" height="96" width="96"/>
+
+# Google Cloud Video Intelligence API Node.js Samples
+
+The [Cloud Video Intellience API][video_docs] allows developers to easily
+integrate video analysis within applications, including video labeling, face
+detection, and shot change detection.
+
+[video_docs]: https://cloud.google.com/video-intelligence/docs/
+
+## Table of Contents
+
+* [Setup](#setup)
+* [Running](#running)
+
+## Setup
+
+1. Read [Prerequisites][prereq] and [How to run a sample][run] first.
+1. Install dependencies:
+
+        npm install
+
+[prereq]: ../README.md#prerequisities
+[run]: ../README.md#how-to-run-a-sample
+
+## Running
+
+View the [documentation][analyze_docs] or the [source code][analyze_code].
+
+```
+node analyze.js
+Commands:
+  faces <gcsPath>   Analyzes faces in a video using the Cloud Video Intelligence API.
+  shots <gcsPath>   Analyzes shot angles in a video using the Cloud Video Intelligence API.
+  labels <gcsPath>  Labels objects in a video using the Cloud Video Intelligence API.
+
+Options:
+  --help  Show help                                                                                            [boolean]
+
+Examples:
+  node analyze.js faces gs://my-bucket/my-video.mp4
+  node analyze.js shots gs://my-bucket/my-video.mp4
+  node analyze.js labels gs://my-bucket/my-video.mp4
+
+```
+
+[analyze_docs]: https://cloud.google.com/video-intelligence/docs
+[analyze_code]: analyze.js