Add GitHub templates for issues and PRs

.github/ISSUE_TEMPLATE.md

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+### Cookbook Version
+[Version of the cookbook where you are encountering the issue]
+
+### Chef Client Version
+[Version of chef-client in your environment]
+
+### Platform Details
+[Operating system distribution and release version. Cloud provider if running in the cloud]
+
+### Scenario
+[What you are trying to achieve and you can't?]
+
+### Steps to Reproduce
+[If you are filing an issue what are the things we need to do in order to repro your problem? How are you using this cookbook or any resources it includes?]
+
+### Expected Result
+[What are you expecting to happen as the consequence of above reproduction steps?]
+
+### Actual Result
+[What actually happens after the reproduction steps? Include the error output or a link to a gist if possible.]

.github/PULL_REQUEST_TEMPLATE.md

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+### Description
+
+[Describe what this change achieves]
+
+### Issues Resolved
+
+[List any existing issues this PR resolves]
+
+### Contribution Check List
+
+- [ ] All tests pass.
+- [ ] New functionality includes testing.
+- [ ] New functionality has been documented in the README and metadata if applicable.
+
+See [CONTRIBUTING.md](https://github.com/zuazo/dovecot-cookbook/blob/master/CONTRIBUTING.md).