Create issue_template.md (#972)

* Create issue_template.md

* Comment out security issue

* Add more comments

.github/issue_template.md

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+
+<!--
+Thanks for opening an issue! Please help us address your bug:
+
+- The issue tracker is only for bugs and feature requests.
+- Before reporting a bug, please make sure your version of Dat updated to the latest release.
+- If you have a question or need general advice, ask us in our Chat: http://chat.datproject.org (#dat on IRC, freenode)
+-->
+
+I am reporting:
+
+- [ ] a bug or unexpected behavior
+- [ ] general feedback
+- [ ] feature request
+- [ ] security issue <!-- see security issue note below -->
+
+<!--
+**Security Issue:** 
+
+Are you reporting a security issue that would impact general users? Please email us at security@datproject.org to report.
+-->
+
+# Bug Report
+
+Please give us details about your installation to assist you. Run `dat -v` to see the version of Dat you are using.
+
+* Operating system:
+* Node Version:
+* Dat Version:
+
+### Expected behavior
+
+<!-- What do you think should happen? -->
+
+### Actual behavior
+
+<!-- What actually happens? -->
+
+### Debug Logs
+
+<!-- If it is easy to reproduce your bug, please run with the debug output so we can see what is going on. Type `DEBUG=dat* <your-command>` to print debug logs. -->