Add issue template for github issues (#2526)

ISSUE_TEMPLATE.md

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+<!--
+Verify first that your issue/request is not already reported on GitHub.
+Also test if the latest release and master branch are affected too.
+Always add information AFTER of these HTML comments, but no need to delete the comments.
+-->
+
+##### ISSUE TYPE
+<!-- Pick one below and delete the rest -->
+ * Bug Report
+ * Improvement Request
+ * Enhancement Request
+ * Feature Idea
+ * Documentation Report
+ * Other
+
+##### COMPONENT NAME
+<!--
+Categorize the issue, e.g. API, VR, VPN, UI, etc.
+-->
+~~~
+
+~~~
+
+##### CLOUDSTACK VERSION
+<!--
+New line separated list of affected versions, commit ID for issues on master branch.
+-->
+
+~~~
+
+~~~
+
+##### CONFIGURATION
+<!--
+Information about the configuration if relevant, e.g. basic network, advanced networking, etc.  N/A otherwise
+-->
+
+
+##### OS / ENVIRONMENT
+<!--
+Information about the environment if relevant, N/A otherwise
+-->
+
+
+##### SUMMARY
+<!-- Explain the problem/feature briefly -->
+
+
+##### STEPS TO REPRODUCE
+<!--
+For bugs, show exactly how to reproduce the problem, using a minimal test-case. Use Screenshots if accurate.
+
+For new features, show how the feature would be used.
+-->
+
+<!-- Paste example playbooks or commands between quotes below -->
+~~~
+
+~~~
+
+<!-- You can also paste gist.github.com links for larger files -->
+
+##### EXPECTED RESULTS
+<!-- What did you expect to happen when running the steps above? -->
+
+~~~
+
+~~~
+
+##### ACTUAL RESULTS
+<!-- What actually happened? -->
+
+<!-- Paste verbatim command output between quotes below -->
+~~~
+
+~~~