Add issue template

.github/ISSUE_TEMPLATE.md

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+## Steps to reproduce
+
+How'd you do it?
+
+1. ...
+2. ...
+
+This section should also tell us any relevant information about the
+environment; for example, if an exploit that used to work is failing,
+tell us the victim operating system and service versions.
+
+## Expected behavior
+
+What should happen?
+
+## Current behavior
+
+What happens instead?
+
+You might also want to check the last ~1k lines of
+`/opt/metasploit/apps/pro/engine/config/logs/framework.log` or
+`~/.msf4/logs/framework.log` for relevant stack traces
+
+
+## System stuff
+
+### Metasploit version
+
+Get this with the `version` command in msfconsole (or `git log -1 --pretty=oneline` for a source install).
+
+### I installed Metasploit with:
+- [ ] Kali package via apt
+- [ ] Omnibus installer (nightly)
+- [ ] Commercial/Community installer (from download.rapid7.com)
+- [ ] Source install (please specify ruby version)
+
+### OS
+
+What OS are you running Metasploit on?
+
+