.github: Add ISSUE_TEMPLATE/bug_report.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐛  Bug Report
+about: Report a bug to help Vegeta improve.
+---
+
+<!-- ⚠️ If you do not respect this template your bug report issue will be closed. -->
+
+### Version and Runtime
+
+```
+Paste the output of `vegeta -version` here.
+If you are not running the latest version of Vegeta, please try upgrading because your issue may have already been fixed.
+```
+
+#### Expected Behaviour
+
+<!-- What did you expect to see?  -->
+
+#### Actual Behaviour
+
+<!-- What did you see instead?  -->
+
+#### Steps to Reproduce
+
+<!-- Please list the full steps required to reproduce the bug -->
+
+1. Step 1
+1. Step N
+
+### Additional Context
+
+<!--
+
+Are there any other related GitHub issues (open or closed) or Pull Requests that should be linked here?
+Is there anything atypical to be known about your situation?
+Anything else?
+
+-->