Add issue and PR templates

Author: Stephen Pinkerton

.github/ISSUE_TEMPLATE/issue_template.md

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+---
+name: Bug Report / Feature Request
+about: File an issue for this repo
+---
+
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+  1.
+  1.
+  1.
+
+## Specifications
+
+  - Version:
+  - Runtime:

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+*Note: Please remember to review the Datadog [Contribution Guidelines](https://github.com/DataDog/dd-agent/blob/master/CONTRIBUTING.md)
+if you have not yet done so.*
+
+### What does this PR do?
+
+A brief description of the change being made with this pull request.
+
+### Motivation
+
+What inspired you to submit this pull request?
+
+### Testing Guidelines
+
+An overview on [testing](https://github.com/DataDog/dd-agent/blob/master/tests/README.md)
+is available in our contribution guidelines.
+
+### Additional Notes
+
+Anything else we should know when reviewing?