Adds DLP samples (GoogleCloudPlatform#405)

Author: bshaffer

dlp/README.md

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+# Google DLP PHP Sample Application
+
+## Description
+
+This simple command-line application demonstrates how to invoke Google
+DLP API from PHP.
+
+## Build and Run
+1.  **Enable APIs** - [Enable the DLP API](
+    https://console.cloud.google.com/flows/enableapi?apiid=dlp.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/dlp
+```
+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 dlp.php`. The following commands are available:
+
+    ```
+    help               Displays help for a command
+    inspect-datastore  Inspect Cloud Datastore using the Data Loss Prevention (DLP) API.
+    inspect-file       Inspect a file using the Data Loss Prevention (DLP) API.
+    inspect-string     Inspect a string using the Data Loss Prevention (DLP) API.
+    list               Lists commands
+    list-categories    Lists all Info Type Categories for the Data Loss Prevention (DLP) API.
+    list-info-types    Lists all Info Types for the Data Loss Prevention (DLP) API.
+    redact-string      Redact sensitive data from a string using the Data Loss Prevention (DLP) API.
+    ```
+
+    Example:
+
+    ```
+    $ php dlp.php inspect-string 'Robert Frost'
+    Findings:
+      Quote: Robert
+      Info type: US_MALE_NAME
+      Likelihood: Very likely
+    ```
+
+
+6. Run `php dlp.php COMMAND --help` to print information about the usage of each command.
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../LICENSE)

dlp/composer.json

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+{
+    "name": "google/dlp-sample",
+    "type": "project",
+    "require": {
+        "google/cloud-dlp": "^0.1.0",
+        "symfony/console": "^3.3"
+    },
+    "autoload": {
+        "files": [
+             "src/inspect_datastore.php",
+             "src/inspect_file.php",
+             "src/inspect_string.php",
+             "src/list_categories.php",
+             "src/list_info_types.php",
+             "src/redact_string.php"
+        ]
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4"
+    }
+}