Added "Open in Cloud Shell" buttons to README files [(#1254)](GoogleCloudPlatform/python-docs-samples#1254)

Author: michaelawyu

samples/snippets/api/README.rst

@@ -3,6 +3,10 @@
 Stackdriver Error Reporting Python Samples
 ===============================================================================
 
+.. image:: https://gstatic.com/cloudssh/images/open-btn.png
+   :target: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=error_reporting/api/README.rst
+
+
 This directory contains samples for Stackdriver Error Reporting. `Stackdriver Error Reporting`_ aggregates and displays errors produced in
  your running cloud services.
 
@@ -55,6 +59,10 @@ Samples
 Report Exception
 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
+.. image:: https://gstatic.com/cloudssh/images/open-btn.png
+   :target: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=error_reporting/api/report_exception.py;error_reporting/api/README.rst
+
+
 
 
 To run this sample:

samples/snippets/api/README.rst.in

@@ -17,3 +17,5 @@ samples:
   file: report_exception.py
 
 cloud_client_library: true
+
+folder: error_reporting/api

samples/snippets/fluent_on_compute/README.md

@@ -1,5 +1,10 @@
 # Google Error Reorting Samples Samples
 
+[![Open in Cloud Shell][shell_img]][shell_link]
+
+[shell_img]: http://gstatic.com/cloudssh/images/open-btn.png
+[shell_link]: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=error_reporting/fluent_on_compute/README.md
+
 This section contains samples for [Google Cloud Error Reporting](https://cloud.google.com/error-reporting).
 
 A startup script has been provided to demonstrated how to properly provision a GCE