Add github issue and PR templates

.github/ISSUE_TEMPLATE.md

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+# Version:
+
+[Version of the project installed]
+
+# Environment: [Details about the environment such as the Operating System, cookbook details, etc...]
+
+# 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?]
+
+# Expected Result:
+
+[What are you expecting to happen as the consequence of above reproduction steps?]
+
+# Actual Result:
+
+[What actually happens after the reproduction steps?]

.github/PULL_REQUEST_TEMPLATE.md

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+### Description
+
+[Please describe what this change achieves]
+
+### Issues Resolved
+
+[List any existing issues this PR resolves, or any Discourse or
+StackOverflow discussion that's relevant]
+
+### Check List
+
+- [ ] New functionality includes tests
+- [ ] All tests pass
+- [ ] All commits have been signed-off for the Developer Certificate of Origin. See <https://github.com/chef/chef/blob/master/CONTRIBUTING.md#developer-certification-of-origin-dco>