Add Kiwi TCMS badges

now that we've configured the environment to report results to
the same TestPlan we can get the URL of that plan and share it
with our stakeholders.

To make it easier to discover we add badges for TAP and junit.xml
TestPlans.

README.rst

@@ -5,5 +5,14 @@ Demonstration of Kiwi TCMS plugins
     :target: https://travis-ci.org/kiwitcms/plugin-demmo
     :alt: Travis CI
 
+.. image:: https://img.shields.io/badge/kiwi%20tcms-results-9ab451.svg
+    :target: https://tcms.kiwitcms.org/plan/14/
+    :alt: [TAP] TP for kiwitcms/plugin-demo (master)
+
+.. image:: https://img.shields.io/badge/kiwi%20tcms-results-9ab451.svg
+    :target: https://tcms.kiwitcms.org/plan/15/
+    :alt: [junit.xml] TP for kiwitcms/plugin-demo (master)
+
+
 This repository is used to demonstrate how various Kiwi TCMS plugins work
 and how they can be controlled via environment variables.