adds App Engine Standard samples for using gRPC with Monitoring and Spanner (GoogleCloudPlatform#480)

Author: bshaffer

appengine/standard/grpc/README.md

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+# gRPC for App Engine (standard)
+
+This app demonstrates how to run gRPC client libraries on App Engine Standard.
+
+## Setup
+
+- Install [`composer`](https://getcomposer.org)
+- Install dependencies by running:
+
+    ```sh
+    composer install
+    ```
+
+- Install the [Google Cloud SDK](https://developers.google.com/cloud/sdk/).
+
+## Deploy to App Engine
+
+### Run Locally
+
+These samples cannot be run locally with the Dev AppServer because gRPC has not
+been packaged with the Dev AppServer for PHP at this time.
+
+### Deploy with gcloud
+
+**The Cloud Monitoring sample**
+
+The monitoring sample will work out of the box by doing the following:
+
+
+```
+gcloud config set project YOUR_PROJECT_ID
+gcloud app deploy
+gcloud app browse
+```
+
+The last command will open `https://{YOUR_PROJECT_ID}.appspot.com/`
+in your browser. Browse to `/monitoring` to see the sample.
+
+**The Cloud Spanner sample**
+
+You will need to create a [Spanner Instance][create_instance] and a
+[Spanner Database][create_database].
+
+Next, open up `spanner.php` in a text editor and change the values of
+`your-instance-id` and `your-database-id` to the Instance ID and Database ID you
+created.
+
+Now you can deploy your application and it will work as expected:
+
+```
+gcloud config set project YOUR_PROJECT_ID
+gcloud app deploy
+gcloud app browse
+```
+
+The last command will open `https://{YOUR_PROJECT_ID}.appspot.com/`
+in your browser. Browse to `/spanner` to see the sample.
+
+[create_database]: https://cloud.google.com/spanner/docs/quickstart-console#create_a_database
+[create_instance]: https://cloud.google.com/spanner/docs/quickstart-console#create_an_instance

appengine/standard/grpc/app.yaml

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+runtime: php55
+api_version: 1
+
+handlers:
+- url: /monitoring
+  script: monitoring.php
+- url: /spanner
+  script: spanner.php
+- url: /.*
+  script: index.html

appengine/standard/grpc/composer.json

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+{
+    "require": {
+        "google/cloud-spanner": "^0.8.0",
+        "google/cloud-monitoring": "^0.6.0"
+    },
+    "require-dev": {
+        "google/cloud-tools": "^0.6.7",
+        "phpunit/phpunit": "~4"
+    }
+}