GCP Cloud Run manager terraform module

This module manages a Cloud Run-hosted container. It takes care of making sure the container is connected to a Cloud SQL instance and sets environment variables on the application.

Closes #1 (closed)

examples/root-example/README.md

+# Simple example
+
+This is a simple example of deploying a Cloud Run hosted container into a
+GCP project. Specify the project to deploy into and the sql instance to connect to
+on the command line. The sql instance connection is optional, use an empty string 
+if you do not want to connect Cloud Run to a SQL instance.
+So, for example, to deploy to the project ``my-project``:
+
+```console
+$ terraform init
+$ terraform apply -var project=my-project -var sql_instance_connection_name=example
+```
+
+In this example, terraform is configured to use default application credentials.
+For Google APIs and these credentials should correspond to a user with owner or
+editor access to the target project. You can use the ``gcloud`` command line
+tool to set your personal credentials as application default credentials. See
+the ``gcloud auth application-default`` command output for more information.