Add Vision API Samples. (GoogleCloudPlatform#235)

Author: SurferJeffAtGoogle

vision/api/README.md

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+# Google Vision PHP Sample Application
+
+## Description
+
+This simple command-line application demonstrates how to invoke Google 
+Vision API from PHP.
+
+## Build and Run
+1.  **Enable APIs** - [Enable the Vision API](https://console.cloud.google.com/flows/enableapi?apiid=vision.googleapis.com)
+    and create a new project or select an existing project.
+2.  **Download The Credentials** - Click "Go to credentials" after enabling the APIs. Click "New Credentials"
+    and select "Service Account Key". Create a new service account, use the JSON key type, and
+    select "Create". Once downloaded, set the environment variable `GOOGLE_APPLICATION_CREDENTIALS`
+    to the path of the JSON key that was downloaded.
+3.  **Clone the repo** and cd into this directory
+```
+    $ git clone https://github.com/GoogleCloudPlatform/php-docs-samples
+    $ cd php-docs-samples/vision/api
+```
+4.  **Install dependencies** via [Composer](http://getcomposer.org/doc/00-intro.md).
+    Run `php composer.phar install` (if composer is installed locally) or `composer install`
+    (if composer is installed globally).
+5.  Run `php vision.php`. The following commands are available:
+```
+  face         Detect faces in an image using Google Cloud Vision API
+  help         Displays help for a command
+  label        Detect labels in an image using Google Cloud Vision API
+  landmark     Detect landmarks in an image using Google Cloud Vision API
+  list         Lists commands
+  logo         Detect logos in an image using Google Cloud Vision API
+  property     Detect image proerties in an image using Google Cloud Vision API
+  safe-search  Detect adult content in an image using Google Cloud Vision API
+  text         Detect text in an image using Google Cloud Vision API
+```
+6. Run `php vision.php COMMAND --help` to print information about the usage of each command.
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../LICENSE)

vision/api/composer.json

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+{
+    "name": "google/translate-sample",
+    "type": "project",
+    "require": {
+        "google/cloud": "^0.11.1",
+        "symfony/console": "^3.1"
+    },
+    "autoload": {
+        "psr-4": {
+            "Google\\Cloud\\Samples\\Vision\\": "src/"
+        }
+    }
+}