Adds IOT samples (GoogleCloudPlatform#581)

Author: bshaffer

iot/README.md

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+# Google IOT PHP Sample Application
+
+[![Open in Cloud Shell][shell_img]][shell_link]
+
+[shell_img]: http://gstatic.com/cloudssh/images/open-btn.png
+[shell_link]: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googlecloudplatform/php-docs-samples&page=editor&working_dir=iot
+
+## Description
+
+This simple command-line application demonstrates how to invoke Google
+IOT API from PHP. These samples are best seen in the context of the
+[Official API Documentation](https://cloud.google.com/iot/docs).
+
+## Build and Run
+1.  **Enable APIs** - [Enable the IOT API](
+    https://console.cloud.google.com/flows/enableapi?apiid=iot.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/iot
+```
+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 iot.php`. The following commands are available:
+
+    ```
+    create-es-device      Create a new device with the given id, using ES256 for authentication.
+    create-registry       Creates a registry and returns the result.
+    create-rsa-device     Create a new device with the given id, using RS256 for authentication.
+    create-unauth-device  Create a new device without authentication.
+    delete-device         Delete the device with the given id.
+    delete-registry       Deletes the specified registry.
+    get-device            Retrieve the device with the given id.
+    get-device-configs    Lists versions of a device config in descending order (newest first).
+    get-device-state      Retrieve a device's state blobs.
+    get-iam-policy        Retrieves IAM permissions for the given registry.
+    get-registry          Retrieves a device registry.
+    help                  Displays help for a command
+    list                  Lists commands
+    list-devices          List all devices in the registry.
+    list-registries       List all registries in the project.
+    patch-es-device       Patch device with ES256 public key.
+    patch-rsa-device      Patch device with RSA256 certificate.
+    set-device-config     Patch device with RSA256 certificate.
+    set-device-state      Sets the state of a device.
+    set-iam-policy        Sets IAM permissions for the given registry to a single role/member.    ```
+
+    Example:
+
+    ```
+    $ php iot.php create-registry my-registry my-pubsub-topic
+    Creating Registry
+    Id: my-registry, Name: projects/my-project/locations/us-central1/registries/my-registry
+    ```
+
+
+6. Run `php iot.php COMMAND --help` to print information about the usage of each command.
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../LICENSE)

iot/composer.json

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+{
+    "name": "google/iot-sample",
+    "type": "project",
+    "require": {
+        "google/cloud": "dev-master as 0.53.0",
+        "symfony/console": "^3.3"
+    },
+    "autoload": {
+        "files": [
+            "src/create_es_device.php",
+            "src/create_registry.php",
+            "src/create_rsa_device.php",
+            "src/create_unauth_device.php",
+            "src/delete_device.php",
+            "src/delete_registry.php",
+            "src/get_iam_policy.php",
+            "src/get_device.php",
+            "src/get_device_state.php",
+            "src/get_device_configs.php",
+            "src/get_registry.php",
+            "src/list_devices.php",
+            "src/list_registries.php",
+            "src/patch_es.php",
+            "src/patch_rsa.php",
+            "src/set_device_config.php",
+            "src/set_device_state.php",
+            "src/set_iam_policy.php"
+        ]
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^5"
+    }
+}