Generate readmes for most service samples [(#599)](GoogleCloudPlatform/python-docs-samples#599)

Author: Jon Wayne Parrott

samples/snippets/v3/README.md

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+.. This file is automatically generated. Do not edit this file directly.
+
+Stackdriver Monitoring Python Samples
+===============================================================================
+
+This directory contains samples for Stackdriver Monitoring. `Stackdriver Monitoring `_ collects metrics, events, and metadata from Google Cloud Platform, Amazon Web Services (AWS), hosted uptime probes, application instrumentation, and a variety of common application components including Cassandra, Nginx, Apache Web Server, Elasticsearch and many others. Stackdriver ingests that data and generates insights via dashboards, charts, and alerts.
+
+
+
+
+.. _Stackdriver Monitoring: https://cloud.google.com/monitoring/docs 
+
+Setup
+-------------------------------------------------------------------------------
+
+
+Authentication
+++++++++++++++
+
+Authentication is typically done through `Application Default Credentials`_,
+which means you do not have to change the code to authenticate as long as
+your environment has credentials. You have a few options for setting up
+authentication:
+
+#. When running locally, use the `Google Cloud SDK`_
+
+    .. code-block:: bash
+
+        gcloud beta auth application-default login
+
+
+#. When running on App Engine or Compute Engine, credentials are already
+   set-up. However, you may need to configure your Compute Engine instance
+   with `additional scopes`_.
+
+#. You can create a `Service Account key file`_. This file can be used to
+   authenticate to Google Cloud Platform services from any environment. To use
+   the file, set the ``GOOGLE_APPLICATION_CREDENTIALS`` environment variable to
+   the path to the key file, for example:
+
+    .. code-block:: bash
+
+        export GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account.json
+
+.. _Application Default Credentials: https://cloud.google.com/docs/authentication#getting_credentials_for_server-centric_flow
+.. _additional scopes: https://cloud.google.com/compute/docs/authentication#using
+.. _Service Account key file: https://developers.google.com/identity/protocols/OAuth2ServiceAccount#creatinganaccount
+
+Install Dependencies
+++++++++++++++++++++
+
+#. Install `pip`_ and `virtualenv`_ if you do not already have them.
+
+#. Create a virtualenv. Samples are compatible with Python 2.7 and 3.4+.
+
+    .. code-block:: bash
+
+        $ virtualenv env
+        $ source env/bin/activate
+
+#. Install the dependencies needed to run the samples.
+
+    .. code-block:: bash
+
+        $ pip install -r requirements.txt
+
+.. _pip: https://pip.pypa.io/
+.. _virtualenv: https://virtualenv.pypa.io/
+
+Samples
+-------------------------------------------------------------------------------
+
+List resources
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+
+
+To run this sample:
+
+.. code-block:: bash
+
+    $ python list_resources.py
+
+    usage: list_resources.py [-h] --project_id PROJECT_ID
+    
+     Sample command-line program for retrieving Stackdriver Monitoring API V3
+    data.
+    
+    See README.md for instructions on setting up your development environment.
+    
+    To run locally:
+    
+        python list_resources.py --project_id=<YOUR-PROJECT-ID>
+    
+    optional arguments:
+      -h, --help            show this help message and exit
+      --project_id PROJECT_ID
+                            Project ID you want to access.
+
+
+Custom metrics
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+
+
+To run this sample:
+
+.. code-block:: bash
+
+    $ python custom_metric.py
+
+    usage: custom_metric.py [-h] --project_id PROJECT_ID
+    
+     Sample command-line program for writing and reading Stackdriver Monitoring
+    API V3 custom metrics.
+    
+    Simple command-line program to demonstrate connecting to the Google
+    Monitoring API to write custom metrics and read them back.
+    
+    See README.md for instructions on setting up your development environment.
+    
+    This example creates a custom metric based on a hypothetical GAUGE measurement.
+    
+    To run locally:
+    
+        python custom_metric.py --project_id=<YOUR-PROJECT-ID>
+    
+    optional arguments:
+      -h, --help            show this help message and exit
+      --project_id PROJECT_ID
+                            Project ID you want to access.
+
+
+
+
+.. _Google Cloud SDK: https://cloud.google.com/sdk/

samples/snippets/v3/README.rst

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+# This file is used to generate README.rst
+
+product:
+  name: Stackdriver Monitoring
+  short_name: Stackdriver Monitoring
+  url: https://cloud.google.com/monitoring/docs
+  description: > 
+    `Stackdriver Monitoring `_ collects metrics, events, and metadata from
+    Google Cloud Platform, Amazon Web Services (AWS), hosted uptime probes,
+    application instrumentation, and a variety of common application components
+    including Cassandra, Nginx, Apache Web Server, Elasticsearch and many
+    others. Stackdriver ingests that data and generates insights via
+    dashboards, charts, and alerts.
+
+setup:
+- auth
+- install_deps
+
+samples:
+- name: List resources
+  file: list_resources.py
+  show_help: true
+- name: Custom metrics
+  file: custom_metric.py
+  show_help: true