Adds App Engine PHP 72 getting started sample (GoogleCloudPlatform#655)

Author: bshaffer

appengine/php72/getting-started/.gcloudignore

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+# This file specifies files that are *not* uploaded to Google Cloud Platform
+# using gcloud. It follows the same syntax as .gitignore, with the addition of
+# "#!include" directives (which insert the entries of the given .gitignore-style
+# file at that point).
+#
+# For more information, run:
+#   $ gcloud topic gcloudignore
+#
+.gcloudignore
+# If you would like to upload your .git directory, .gitignore file or files
+# from your .gitignore file, remove the corresponding line
+# below:
+.git
+.gitignore
+
+# PHP Composer dependencies:
+vendor/

appengine/php72/getting-started/README.md

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+# Getting Started on App Engine for PHP 7.2
+
+This application is meant to help run a small PHP application which integrates with Cloud SQL and Cloud Storage on App Engine Standard for PHP 7.2. The tutorial uses the Slim framework.

appengine/php72/getting-started/app.yaml

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+# See https://cloud.google.com/appengine/docs/standard/php/config/appref for a
+# complete list of `app.yaml` directives.
+
+runtime: php72
+instance_class: F2
+
+env_variables:
+    GOOGLE_BUCKET_NAME: ""
+    # populate these to use the "mysql" or "postres" backends
+    CLOUDSQL_CONNECTION_NAME: ""
+    CLOUDSQL_USER: ""
+    CLOUDSQL_PASSWORD: ""
+    ## Uncomment to give your database a name other than "bookshelf"
+    # CLOUDSQL_DATABASE_NAME: ""

appengine/php72/getting-started/composer.json

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+{
+  "require": {
+    "google/cloud-storage": "^1.6",
+    "slim/slim": "^3.0",
+    "slim/twig-view": "^2.4"
+  },
+  "autoload": {
+     "psr-4": {
+       "Google\\Cloud\\Samples\\AppEngine\\GettingStarted\\": "src"
+     }
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^5",
+    "google/cloud-tools": "^0.8.0"
+  }
+}