adds error reporting quickstart (GoogleCloudPlatform#299)

Author: bshaffer

error_reporting/quickstart/README.md

@@ -0,0 +1,28 @@
+# Stackdriver Error Reporting
+
+`quickstart.php` is a simple command-line program to demonstrate logging an
+exception to Stackdriver Error Reporting.
+
+To use this sample, you must first [enable the Stackdriver Error Reporting API][0]
+
+# Running locally
+
+Use the [Cloud SDK](https://cloud.google.com/sdk) to provide authentication:
+
+    gcloud beta auth application-default login
+
+Open `quickstart.php` in a text editor and replace the text `YOUR_PROJECT_ID`
+with your Project ID.
+
+Run the samples:
+
+```sh
+php quickstart.php
+Exception logged to Stack Driver Error Reporting
+```
+
+View [Stackdriver Error Reporting][0] in the Cloud Console to see the logged
+exception.
+
+[0]: https://console.cloud.google.com/flows/enableapi?apiid=clouderrorreporting.googleapis.com
+[1]: https://console.cloud.google.com/errors

error_reporting/quickstart/composer.json

@@ -0,0 +1,8 @@
+{
+    "require": {
+        "google/cloud": "^0.20.1"
+    },
+    "require-dev": {
+        "google/cloud-tools": "^0.6"
+    }
+}