Add github issue and pull request templates.

.github/ISSUE_TEMPLATE.md

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+### Steps to reproduce
+
+Tell us what actions you performed before the issue occurred
+
+### Expected behavior
+
+Tell us what should have happened
+
+### Actual behavior
+
+Tell us what happened instead
+
+### Environment
+
+**OS**:
+
+**asdf version**:

.github/PULL_REQUEST_TEMPLATE.md

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+# Summary
+
+Provide a general description of the code changes in your pull request.
+
+Fixes: List issue numbers here
+
+## Other Information
+
+If there is anything else that is relevant to your pull request include that
+information here.
+
+Thank you for contributing to asdf!